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What Should I Set PCIe Frequency When Overclocking?

Overclocking is simply the process of increasing a device’s clock rate. This makes it run much faster which in turn increases the number of operations it can do in a second. While overclocking CPU is common, you can also overclock the PCIe slot. Read on to find out what should I set PCIe frequency when Overclocking and also whether increasing the speed is worth it.

Generally the 100 MHz default speed of the PCIe should not be tampered with much if you want to have a stable system. However, it is a given fact that increasing PCIe clock speed to a higher number such as 110 MHz can improve the performance – albeit may result in system crashes.

Overclocking PCIe slot lets you increase their data transfer rates, hence performance (technically). To achieve this, you need to go above the 100MHz default speed. However, whether it is recommended or not is another story.

Overclocking generally results in more heat production so you will need effective cooling. But a side effect is you can start getting crashes. This is why you may need test and test in order to find the right number. If the PCIe overclocking results in crashes then going back to default is recommended.

What Should I Set PCIe Frequency When Overclocking?

What Should I Set PCIe Frequency When Overclocking
PCIe default clock speed is 100 MHz. Source: Xilinx

Whenever you do an overclock, the main aim is to squeeze out some more performance from your hardware. Increasing the clock speed lets you do more, by outputting and transferring data at a higher rate.

100MHz is the defaults stable clock speed and is usually enough for most users running most tasks.

However, if you have an overclocked processor and need to bring out better performance from your PCIe bus, you can increase the clock speed.

To determine what should I set PCIe frequency when overclocking, here are some things to consider.

Also Read:

The Benefits

dos PCIe speed
PCIe Bus Speed in DOS

The benefits of overclocking include increased data rates across the system. You will have the ability to increase your computer’s PCIe speed.

Increasing the clock speeds can help with the rendering of textures. Users have reported better textures with an overclocked PCIe frequency. This adds a bit more performance to gameplay without sacrificing on the frames or having to lower some presets. This is the case with a graphics card.

Furthermore, users have also noticed some significant improvements in frame rates in some very demanding games. You can even get better performance in benchmarks when using expansion cards over an overclocked PCIe bus.

The Drawbacks

Overclocking any part of the computer introduces certain risks to the system, and this is the same with increasing the PCIe frequency.

Once you know what should I set PCIe frequency when overclocking, it is ideal to keep within the safe parameters.

One of the things you will notice is that the system will run a bit hotter. The computer will be drawing it more current and heat will be produced in the process. The heat will need to go somewhere – preferably outside the computer.

If you do not have a good cooling solution, you may end up getting poor performance even with a higher clock speed due to throttling, a safeguard that’s put in place to protect the components of the system from damage due to excessive heat.

If the temperatures exceed certain thresholds you will end up losing more than up to 50% of the clock frequency. This will defeat the initial purpose of overclocking as you get worse performance in the long run.

But besides the overheat, the one very important and common issue with PCIe overclocking is system crashes or the expansion cards installed failing to operate.

Now let’s see what should I set PCIe frequency when overclocking.

Different PCIe Overclocked Frequencies:

101-110 MHz

With the default frequency set at 100MHz, you may want to experiment with higher frequency values to tray and max out your system’s performance.

As initially stated, for more safety, you should do this in steps so that you see which values are not ideal for your system.

This range is typically fine as you do not make extremely high changes to your operating frequency.

Doing this small margin should allow you to see benefits such as higher data through puts. These can be seen via benchmarks and in some cases, the benefits will be seen in real-world performance.

Furthermore, this range offers good stability for your system. You will not need to worry about getting too many crashes or the grim Blue Screen of Death (BSOD).

One of the things you may need to watch out for is temperature spikes in your system. Having an adequate supply of cooling fans should help with this.


At these high values, you may see some performance improvements, however, you will also have to deal with a lot of crashes, sometimes happening back to back.

The system might become unstable at these high values because your cards are now getting and transmitting more data than they are built for.

However, it is not unlikely for users to overclock to these high-frequency values and still be stable enough for good operation. It mainly depends on the specific system as well as how its configured.

120 and Above

Some users can get to values above 120 and still be operating fine. However, such high frequencies can be more harmful than good. You may end up doing irreparable damage not only to your card but also to the slot itself.

In some cases, if the PCIe speed is too high above its original value, you may end up with errors when writing data and files to disk. This may result in corrupted and unusable files which can lead to data loss.

Ideal Circumstances

It will be necessary to know how to safely go about this process if you are new to overclocking. Also, knowing how to fix basic issues and keep your system stable during operation is necessary. As there is a risk, you should take care not to damage your setup.

If you are adamant on overclocking the PCIe bus, take things incrementally and gradually.


It’s important to know what should I set PCIe frequency when overclocking if you are an enthusiasts seeking to get most out of your PC.  A safe value means you will suffer fewer problems down the road and also get to enjoy slightly better performance from your hardware.

Overclocking isn’t for everyone and different builds will work with different values. So, to get what value works for yours, you will need to do some experimentation.

The actual number will depend on the motherboard as well as the chipset, but testing your frequency and increasing in small increments will let you find a suitable and stable value for your PCIe frequency when overclocking.y

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