Technology Explained

5 Little-Known Specs That Could Be Slowing Down Your PC

Andy Betts 06-03-2015

When you’re looking to upgrade your computer Do You Know Everything About Computer Hardware? This image will show you every type of hardware we use in pictures. Think of it like a computer part cheat sheet! Read More , or buy a new one, one of your main priorities will be to get something that is faster than you had before.


There are several obvious factors you’ll look for to indicate this improved performance. Things like a higher clock speed for the processor or more RAM will give you immediate improvements, and even support for the latest Wi-Fi or USB standards will produce tangible benefits in some circumstances.

Yet there are many lesser known factors that can also affect the speed of a computer, beyond the headline specs.

We’ll take a look at five of them, and show you how you can always get maximum performance when upgrading.

Processor Cache

When looking at processors, there are a few well-known factors that indicate the level of performance they will provide.

First is the model of the processor itself. In the Intel world, we know that an Intel Core i7 processor is better than an i5 Understanding Intel's Laptop CPU Models: What the Numbers and Letters Mean Looking for a new Intel CPU but don't understand the model numbers and letters? We explain and decode the Intel processor list. Read More , which is better than an i3, and also that the considerable difference in pricing will reflect this.



Then, within a particular model, we can tell that generally a faster clock speed and more cores will produce faster performance. (This isn’t absolute, of course, since newer generations of processor will be better optimised than older ones.)

But there’s another specification that can have massive effect on performance that is often overlooked: the processor cache.

The processor cache is a form of memory dedicated to the processor that works on a similar principle to RAM.


Just as RAM temporarily stores data for applications to quickly access without the need to write it to and retrieve it from the hard drive, the processor cache temporarily stores data that the processor needs continual access to. This means that common CPU tasks can be completed much more quickly.


Processor cache comes in various levels, L1, L2, L3 and even more in newer processors. L1 is a small amount of very fast memory usually built into the processor itself, and each subsequent level is larger and slower. The processor uses each level in order, so that the most important data will be stored in the L1 cache.

Intel’s Haswell-based processors So What's the Difference Between Intel's Haswell and Ivy Bridge CPUs? Looking for a new computer? Those shopping for a new Intel-powered laptop or desktop need to know the differences between the last and the latest generation of Intel processors. Read More have an L1 cache of 64KB per core, L2 of 256KB, L3 of up to 20MB and L4 of up to 128MB.


It’s hard to say how much processor cache you need, but 3-6MB is typical in current laptops and PCs. But given the performance benefits, more cache and a slower clock speed is likely to be faster than the opposite.

Hard Drive Speed

Hard drives are mostly judged in terms of their capacity. The speed of the hard drive can have a big impact on the speed of your computer.

Hard drive speed is measured in revolutions per minute (rpm). It shows how fast the hard drive spins, and so how quickly applications can write and read data from it.



The most common speeds are 5400rpm and 7200rpm, with the latter being common only on the more expensive systems. The drive speed is most noticeable on data intensive tasks, but less so in normal use. For example, a game will have longer load times on a slower drive, but the difference will be negligible when you’re playing.

Another issue in storage is the ever more relevant question of whether to go for a hard drive or solid state drive Using a Small SSD & a Regular Hard Drive: How To Organize Your Files I recently reviewed a Samsung 830 512GB solid state drive that now serves as the primary drive for my computer. Before it, however, I was using a 60GB solid state drive. Why? For the same... Read More (SSD).


If you need a lot of storage then hard drives are still preferable as they are available in much larger sizes at much more affordable prices. But if speed is your priority an SSD is far better.

A Macbook, for instance, with a 5400rpm hard drive will typically take at least twice as long to boot than a similar model with an SSD. Similar speed benefits will be seen in normal use for a wide number of applications too, from video and graphics work to gaming.

Hybrid Drives

There’s also a third type of drive: the hybrid drive. This is often known as an SSHD, and combines a solid state drive and a hard drive in order to provide the speed benefits of the former and the capacity benefits of the latter.

A hybrid drive works by using the SSD portion of the drive for caching. The most commonly used files and data are stored on the solid state drive, from where they can be restored far quicker, leaving only larger files and less-often used data to be retrieved from the hard drive as and when it is needed.

A hybrid drive relies on software managing which files are cached. These files will change over time to ensure the system remains highly optimised.

The presence of a hybrid drive means you can achieve the performance boosts associated with SSDs without the added cost, since only a small SSD is needed as it isn’t used for long term storage of large files.


SSHDs are available from all the normal hard drive manufacturers in the standard 3.5 and 2.5-inch sizes, for desktops and laptops respectively. Any system can easily be upgraded for a significant speed kick.

Similarly, most manufacturers will offer SSHD-equipped Windows laptops and desktops at the mid to high-end of their ranges.

Apple also offers its Fusion Drive for its desktops and MacBooks What is Apple's Fusion Drive & How Does It Work? Solid state drives are awesome. The only snag is that solid state storage is still prohibitively expensive for storing lots of data. The days of cheap SSDs are probably not that far away, but for... Read More . The Fusion Drive also combines an SSD and hard drive, but has subtle differences to a normal hybrid drive.

It combines the two parts of the drive into a single logical drive (so, a Fusion Drive with 1TB hard drive and 128GB SSD would show up as a single 1.12TB drive). The SSD portion is not used for caching. Instead the most commonly used files are actually moved to the faster section of the drive for quicker access.

If you add an SSD to a Mac as a second drive, it is possible to configure the two to function together as a Fusion Drive.

RAM Frequency and Latency

Adding more RAM to your computer is one of the easiest ways to get a performance boost. This is doubly true if you use a hard drive rather than an SSD, since if your apps have plenty of RAM How Much RAM Do You Really Need? How much computer memory do you need? Here's how to check your installed RAM and how much RAM your computer needs. Read More to play with they’re less likely to need to temporarily write data to the hard drive, which can become a major bottleneck.

But even then not all RAM is equal. The speed of your RAM can be affected by both frequency and latency.



The frequency of RAM is measured in megahertz and indicates the amount of data that can be moved to the memory stick at a time.

Higher frequency RAM can give noticeable improvements to PCs with integrated graphics What Is the Difference Between an APU, CPU, and GPU? Confused about computer processor acronyms? It's time to learn the difference between an APU, CPU, and GPU. Read More , but for general use, the differences may not be immediately apparent once you get beyond 1600MHz.



Latency has more impact. Latency measures the delay before the RAM can achieve a specific task, and is displayed by a group of four timings, such as 6-8-7-12. In each case, the lower the number, the faster the performance.

These timings commonly represent:

  • CAS Latency: The most important figure, which displays the number of clock cycles before the memory is able to return a piece of data
  • RAS to CAS delay: The delay, in clock cycles, between a memory bank being activated and the read or write command being sent (the CAS)
  • Row precharge: The number of clock cycles taken to terminate access to one row of memory and begin access to the next
  • Row active time: The number of cycles needed to access a row of data in RAM. This number is normally the largest of the four numbers

Latency is a very technical concept. As a general rule, lower latency timings will produce better performance than a higher frequency, although this is a much debated topic.

It’s often the case that a higher frequency also means higher latency and vice versa, so that the two cancel one another out.

Motherboard Bus Speed

The bus speed of your motherboard is something you’ll only ever need to think about when building your own computer.

It plays an integral role in how fast your computer is, though. The motherboard is the central hub of your system, through which all the other components (processor, RAM, hard drive etc.) communicate.


It also determines which components you can use, and on an ageing system the motherboard can become the performance bottleneck itself by preventing you from upgrading to newer parts.

For example, a motherboard that only supports RAM up to a frequency of 1333MHz may be able to work with 1600MHz RAM, but that faster RAM will be underclocked to the slower speed.


Display resolution

Something you may already be aware of if you play games on your PC or laptop is the effect of the screen resolution on the performance.

The higher the resolution you play a game at, the better the graphics are, but also the more stress put on the CPU and GPU. Unless you are running cutting edge hardware, you may frequently find that you cannot run games at their highest resolution and get an acceptable level of performance at the same time.

This issue isn’t limited just to gaming. An HD monitor, with 1920×1080 resolution, has 2,073,600 pixels. A 1366×768 display — one level below HD, and still very common on laptops — has 1,049,088 pixels, or around half as many pixels. 4K has over eight million pixels.

Sometimes the hardware may simply not be powerful enough to work at these higher resolutions, or you may be required to use the monitor at a much lower refresh rate.

A new Mac Mini can use a 4K monitor Getting A 4K Monitor? Which Browser Should You Use? Running Windows on a 4K monitor can be a huge boon to productivity. The large, pixel-dense space provides plenty of room to open windows. But will browser content scale well on your Ultra HD monitor? Read More but only at a refresh rate of 30Hz. This would be likely to be noticeable even for something as simple as scrolling through a web page, where it is much jerkier than the smooth scrolling you’d get at 60Hz.

It may not directly affect the speed of your computer, but the perceived speed would be far worse.

Making the switch to an HD monitor isn’t likely to cause any problems on a reasonably modern machine. But if you’re eyeing up a new 4K display Why Buying A 4K TV Right Now Is A Waste Of Money With an obvious price difference between the new generation of 4K TVs, and older Full HD models - do you really need 4K? We think not, and here's why. Read More you to need to make sure the rest of your hardware is capable of driving it.


There are many factors that can affect the performance of your computer. Manufacturers will often highlight key numbers to show how their machines are better than rival models. But by looking at the more obscure numbers on the spec sheet you can really get to grips with the kind of performance a PC will deliver.

How closely do you look at the detailed specs of computers and their components? Have you ever upgraded and not got the performance boost you were hoping for? Let us know in the comments below.

Image Credits: Apple computers via Aurimas, Intel i7 processor via Shakib Saifi, Hard drive via William Warby, SSD and hard drive via Simon Wüllhorst, SSHD via Sinchen.LinRAM via Mike Deal, RAM specs screenshot via, Motherboard via Ripton Scott, Dell 5K monitor via

Related topics: Computer Maintenance, Computer Memory, CPU, Hard Drive, Solid State Drive.

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  1. Kp
    November 10, 2018 at 4:03 pm

    I just use my laptop for basic Internet searches and Office programs. Could you help me decide whether a new Dell Inspiron 3567 with a Intel Celeron Processor N3060 (2M Cache, up to 2.48 GHz) would be any faster than my current Dell Inspiron 15 3521, which has a larger cache size (an Intel Core i3-3227U processor (3 M cache, 1.9 GhZ) but is 4 - 5 years old?

  2. Boris
    April 28, 2017 at 5:18 am

    I have a amd a10 7850k cpu and its speed is at 3.7ghz i overclocked it to 4.1ghz. Used it for a year with my GTX 960 sc 4gb. It ran amazingly. But now it dose not want to work fast. So i bought a new cpu the amd a10 7890k stock speed is at 4.1ghz but i have a problem now i dont get any performace when playing games. Like the 7850k started to work super slow and i noticed it. Temps reach lile 74c in heaven benchmark all max settings an 1080p resolition my max frames is 74 lowest is 7

  3. David Sims
    November 13, 2016 at 9:58 pm

    I use M-Disc (DVD or Blu-Ray) for longterm storage. I use SD cards for short term back up.

  4. Money
    August 20, 2016 at 3:55 pm

    Great, precise and useful information for computer illiterates like me who do not want to get ripped off or waste money on bells and whistles. I feel much better equipped and prepare to shop for my new laptop.

  5. Mark Dagpin
    June 22, 2016 at 9:59 am

    Hi! I am planning to use a monitor for my laptop (i.e. plugging my laptop to a bigger monitor) for gaming. My laptop has a decent firepower (16 gb RAM, core i7, and a decent gaming graphics card). But I've read in other sites that if I do this, my game will be slower as it puts stress on my RAM or graphics card considering it has higher resolution (i think). Also, does this affect the performance of my laptop or slow it overtime? I am really considering on buying a monitor because i want to play on a larger screen. Please help me with this. Thank you!

  6. Jill
    January 7, 2016 at 4:18 pm

    Thank you for this comprehensive explanation - that is still comprehend-able to the non-techie!

  7. A41202813GMAIL
    March 8, 2015 at 10:31 am

    Another Thing That Could Be Slowing Down Your PC:

    POS M$ Update(s), Issued In The SUMMER Of 2009, To Force XP Users To Throw Their Entire Digital Life Away And Start Anew With The Up And Coming W7.



  8. Zhong
    March 8, 2015 at 4:46 am

    Do you still need to defrag a hybrid drive?

    • likefunbutnot
      March 9, 2015 at 12:40 pm

      Yes. We don't defrag pure SSDs because they have a life cycle measured in number of writes and because all memory cells are theoretically available with the same degree of latency, negating the need to create contiguous files on disk. Hybrid drives basically just have an oversized cache.

  9. Doc
    March 8, 2015 at 4:34 am

    "Hard drive speed is measured in revolutions per minute (rpm)." Another important factor is hard drive cache - unlike a hybrid drive, this is RAM on the hard disk's controller whose contents is lost on power-down, but improves the hard disk's performance by caching reads and writes. 8MB is typical, while newer drives are likely to have 32MB or 64MB of cache.

  10. Mary Brady
    March 7, 2015 at 7:47 pm

    Andy, thanks for posting. I'm a little older than 9 , without a computer innards technical background. The info is valuable.

  11. ha14
    March 6, 2015 at 9:21 pm

    Getting hard drives in RAID mode can do things faster, you can use multiple disks, but your computer will recognize the RAID as one disk. As Dalsan M pointed out dual channeling , you can check this with CPU-Z under Memory TAB. To use more RAM Windows 64bit edition is needed

    • likefunbutnot
      March 6, 2015 at 10:34 pm

      Putting disks in RAID0 is an actively bad idea for most purposes. You're effectively multiplying the likelihood of data loss due to disk failure. The performance benefit from RAID0 is in sustained transfer rate, meaning that it's only helpful for working with enormous, unfragmented files, something that is seldom the case for anything but content creation work. A single SSD will normally access and transfer data faster than an array of traditional disks just by virtue of its normal operations.
      Why not an array of SSDs then? Because the potential for data loss is still huge AND because most RAID controllers and SSD firmware don't play well together. You'll dramatically shorten the life of SSDs used in RAID0.
      In short: RAID0 bad. SSDs good. RAID0 of SSDs even worse.

      I'm not assessing other types of RAID because very few people have the hardware or software to take advantage of them.

  12. Phids
    March 6, 2015 at 8:42 pm

    Thank you for this article. I may end up referring to it when looking for a new computer to buy.

  13. DalSan M
    March 6, 2015 at 8:01 pm

    I'm surprised that dual channeling the RAM was not mentioned. It is important for anyone that wants to gain as much performance as possible in a compatible system that uses an AMD APU. Similar can be said with Intel processors with integrated GPU. The point to an AMD APU is to get the most graphics performance as possible without resorting to purchasing and installing a discrete graphics card, and integrated graphics rely on the system RAM to perform its duties. If the RAM is not dual channeled, then the memory bandwidth would be cut to about half, which reduces system performance in graphics intensive processing.

  14. Noodles
    March 6, 2015 at 7:28 pm

    I guess you wrote this article for a bunch of nine year olds because anyone who is a little older must be wetting themselves at the simplicity of the article. I mean it is basic stuff - very basic!!!!

    • Devil's Advocate
      March 7, 2015 at 2:24 am

      I guess you either have an extremely high view of yourself or a very low view of everyone else. For some this IS new and for some this is old hat. All you need to do is glance at the article, if it applies and/or interests you then read it otherwise move on, it's written for someone else. No need to be condescending to the writer or other readers

    • Grateful Guy
      March 7, 2015 at 2:42 am

      You're such an idiot.
      If you feel you're above the level of knowledge of the article, simply don't read it, rather than be so unappreciative of the writer's efforts.

    • Devil himself
      March 7, 2015 at 10:25 am

      follow your own advice ... glance over the comments ... and move on ...

    • The Truth
      March 8, 2015 at 5:46 pm

      Devil's advocate.... the title of the article CLEARLY says "5 Little-Known Specs That Could Be Slowing Down Your PC "

      But if Devil's advocate didn't know this.... allow me to tell you the 5 little known items Humans need to survive:


    • tim
      March 20, 2015 at 1:25 pm

      Well I'm 52 but my knowledge of computers is that of a 9 year old. I've only just started looking into it and found this both interesting and helpful. With one exception, your remark!