Overclocking question?

[Jood]

Hi guys and girls,

Just a quick question to all the experts out there.

Cpu memory bandwidth - does memory bandwidth increase when overclocking a cpu?

Pcie interface clock speed - if you have a gpu running in pcie 2.0 x8 config and gets bottlenecked slightly, can you overclock the interface bus speed to get the card out of the bottleneck?

Kind Regards

Thank you

 

[Jood]

Up

 

[Ebrahim Ali]

Should post this overclocking

 

[Jood]

Thanx will ask admin

 

[Jood]

No one tried this before?

 

[Mr_Snippy]

Increase your bclk, you won't see much if any gains and you risk traffic corruption.

 

[Jood]

Its an older motherboard. I can still adjust pcie frequency.

Will that give data corruption aswell? If so, what causes it?

 

[Cedz700]

Hey bud, we recently did an apples to apples comparison to the 8x vs 16x question, although it was based off of using the riser cables in different slots. You literally lose like 2% performance on a 8x connection vs the 16x connection. that is 2 fps for every 100fps. You won't even feel it in the slightest.

I would keep the BCLK at a constant 100 or 125 based on the XMP profile of your memory. Meaning, if your XMP profile sets the BCLK to 125, keep it there. But don't fiddle with it too much, as it affects more than just CPU and PCI bus speeds.

In terms of your bandwidth question: Your bandwidth should go up slightly with faster speeds. Easiest way to see the difference would be to benchmark your memory in AIDA64 and see whether you see a variance in the speeds.

 

[Cedz700]

Its an older motherboard. I can still adjust pcie frequency.

Will that give data corruption aswell? If so, what causes it?

The BCLK frequency as mentioned in my post above affects more than just PCI and CPU frequency, it affects storage speeds, which are VERY sensitive to changes in speeds. So in short, you can choose a higher BCLK, but then you would need to lower your CPU strap ratio and or increase the core voltage. Hardware like nice and even numbers... most of the time it is a matter of trial and error.

 

[Jood]

Hey bud, we recently did an apples to apples comparison to the 8x vs 16x question, although it was based off of using the riser cables in different slots. You literally lose like 2% performance on a 8x connection vs the 16x connection. that is 2 fps for every 100fps. You won't even feel it in the slightest.

I would keep the BCLK at a constant 100 or 125 based on the XMP profile of your memory. Meaning, if your XMP profile sets the BCLK to 125, keep it there. But don't fiddle with it too much, as it affects more than just CPU and PCI bus speeds.

In terms of your bandwidth question: Your bandwidth should go up slightly with faster speeds. Easiest way to see the difference would be to benchmark your memory in AIDA64 and see whether you see a variance in the speeds.

This is exactly what i was looking for and thank you for sharing your findings!