[SOLVED] Running an RX 6600 on PCIe 2.0 x8 ?

[Trak1]

Hey

Thinking of upgrading to rx 6600 as I can buy a used one for around 110$ and apparently rx 6600 only runs on x8 instead of x16 and my old motherboard only supports pcie 2.0 x8 and x16

So obviously a lot of performance will be wasted due to the very old system but I'm wondering how much of a performance would be lost only because I'll be running rx 6600 on pcie 2.0 x8 instead of pcie 3.0/pcie 4.0 x8?

In other words my question is I'll be still getting significantly more performance out of rx 6600 pcie 2.0 x8 with the current old pc in comparison to say gtx 1660 super/ti, gtx1070/1080 which will be running on pcie 2.0 x16?


My system:
Asus P7P55D (LGA1156) https://www.newegg.com/p/N82E16813131404
CPU: I5 750
Memory: 8gb ddr3

 

[Aeacus]

but I'm wondering how much of a performance would be lost only because I'll be running rx 6600 on pcie 2.0 x8 instead of pcie 3.0/pcie 4.0 x8?

A lot.

Essentially, what you have, is 25% of what GPU is capable of.

RX 6600 is PCI-E 4.0 card. PCI-E 3.0 is half of PCI-E 4.0. And PCI-E 2.0 is half of PCI-E 3.0.

Or in other words:
PCI-E 4.0 = 100%
PCI-E 3.0 = 50%
PCI-E 2.0 = 25%

In other words my question is I'll be still getting significantly more performance out of rx 6600 pcie 2.0 x8

No.

GTX 1660/1070/1080 are all PCI-E 3.0 GPUs, and running them on PCI-E 2.0 = 50% performance reduction.

RX 6600, like i said above, is PCI-E 4.0 GPU and performance reduction isn't two times, like with GTX GPUs, but instead 4 times. So, while RX 6600 is equal to GTX 1070 Ti, but in PCI-E 2.0 environment, RX 6600 would perform way worse.

So, don't waste your money on new GPU. Better get new CPU-MoBo-RAM combo.

 

[logainofhades]

You would get better performance out of the 3.0 cards at a full x16, than you would with an RX 6600. None of those 3.0 cards you listed will be adversely affected by running in an x16 2.0 slot. I do recommend a better CPU, motherboard, and ram, though. That platform is much to slow to fully utilize such cards. Even something like an i3 12100, or Ryzen 5 5600 would be a vast improvement, and they are relatively cheap.

 

[Zerk2012]

Hey

Thinking of upgrading to rx 6600 as I can buy a used one for around 110$ and apparently rx 6600 only runs on x8 instead of x16 and my old motherboard only supports pcie 2.0 x8 and x16

So obviously a lot of performance will be wasted due to the very old system but I'm wondering how much of a performance would be lost only because I'll be running rx 6600 on pcie 2.0 x8 instead of pcie 3.0/pcie 4.0 x8?

In other words my question is I'll be still getting significantly more performance out of rx 6600 pcie 2.0 x8 with the current old pc in comparison to say gtx 1660 super/ti, gtx1070/1080 which will be running on pcie 2.0 x16?


My system:
Asus P7P55D (LGA1156) https://www.newegg.com/p/N82E16813131404
CPU: I5 750
Memory: 8gb ddr3

This is with a 6600xt

View: https://m.youtube.com/watch?v=IsvlkIPxh6w

 

[Trak1]

This is with a 6600xt

View: https://m.youtube.com/watch?v=IsvlkIPxh6w

Thanks, I did watch that test before and if that test is accurate then it's not that bad as I'll be upgrading the cpu/ram/mobo in a few months anyway.

Techpowerup did test rx6600 xt version and the results are more or less the same as that youtube video, the difference between pcie 2.0 x8 and pcie 4.0 x8 seems to be between 10-20% in most titles and with 1-2 titles seeing more than 25% difference in frame rates and some others having less than 5% difference.

If these tests were done in a proper way and are indeed accurate then it's not much of an issue for short-term, specially if 0.1%/%1 lows are not affected that much but then again that's going to be the case anyways with the old cpu bottlenecking gpu massively.

https://www.techpowerup.com/review/amd-radeon-rx-6600-xt-pci-express-scaling/6.html

 

[Kil6r]

Thanks, I did watch that test before and if that test is accurate then it's not that bad as I'll be upgrading the cpu/ram/mobo in a few months anyway.

Techpowerup did test rx6600 xt version and the results are more or less the same as that youtube video, the difference between pcie 2.0 x8 and pcie 4.0 x8 seems to be between 10-20% in most titles and with 1-2 titles seeing more than 25% difference in frame rates and some others having less than 5% difference.

If these tests were done in a proper way and are indeed accurate then it's not much of an issue for short-term, specially if 0.1%/%1 lows are not affected that much but then again that's going to be the case anyways with the old cpu bottlenecking gpu massively.

https://www.techpowerup.com/review/amd-radeon-rx-6600-xt-pci-express-scaling/6.html

So...
What performance did you get?