4850 on pcie 1.1

[tigersty1e]

So I couldn't find any articles showing benchmarks of the 4850 at pcie 1.1 and pcie 2.0 speeds at various resolutions and settings.

I know it's been said before that the bottleneck ranges from nothing - 40% on some systems.

http://www.tweaktown.com/artic...performance/index.html

I know there'a an article showing the crossfire performance, but I want to know the single card performance. Anybody got some benches or articles?

 

[dug777]

I doubt there's any performance impact. At all.

 

[error8]

There will be no bottleneck. A 4850 card doesn't use the whole bandwidth a PCI-Ex 1.1 slot has.

 

[faxon]

as far as i know, the only cards that use the full bandwidth are a GTX280, a 4870x2, and maybe a 4870? im not even sure on those though, thats just something i remember reading somewhere.

 

[error8]

Originally posted by: faxon
as far as i know, the only cards that use the full bandwidth are a GTX280, a 4870x2, and maybe a 4870? im not even sure on those though, thats just something i remember reading somewhere.

The first two are using the full bandwidth and the GTX 260/4870 are also very close and probably sometime asking for more and so loosing a bit of performance, but nothing that can really have an important impact. I'm sure though, that the next generation of cards will really start to need a PCI express 2.0 slot.

 

[Murloc]

no bottleneck at all.

 

[apoppin]

i did testing on it

for 4870 no noticeable/practical impact on FPS in a PCIe 1.0 compared to a PCIe 2.0 board; X2 started to have some limitations

 

[betasub]

Originally posted by: faxon
as far as i know, the only cards that use the full bandwidth are a GTX280, a 4870x2, and maybe a 4870? im not even sure on those though, thats just something i remember reading somewhere.

9800GX2?

 

[Veramocor]

I've been looking at building a new computer so this came up with me. Good rule of thumb PCIe-1 equals half the bandwidth on PCIe-2. So x16 on PCIe 1 = a x8 speed on PCIe 2.


Toms Hardware (not that I read that site) had some good testing up:

PCIe bus speeds


If you look at the data, if the PCIe-2 x8 (which is x16 in PCIe-1) has the same performance as the PCIe-2 x16, then you have not maxed out the bus speed.

On a 3850 you do not max out the bus speed.

The performance is sometimes maxed out on the 9800 GX2, with the worst results in very high texture games such as Flight simulator and the card performing at 80% of the level of PCIe-2 x16 when running in PCIe-2 x8 mode (PCIe-1 x16).

However for games including Crysis and Call of Duty there is barely any performance decrease.