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How Much Better Is A 4870 In PCI-E 2 Over PCI-E 1.1?

Overslop

Overslop

Overslop

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I've read about the 4870 performing better in PCI-E 2.0 than PCI-E 1.1 because it needs more bandwidth than PCI-E 1.1 can provide at high resolutions with high setttings.

But I can't find info anywhere that states accurately how much of a benefit PCI-E 2.0 gives. Anyone have a link?
 
take a look at my benchmarks, i went from a 8800 GTX OC to a 4870 on a P5b deluxe board which is PCI-E 1.1 x16 (equivalent to PCI-E 2.0 x8)

The only time I noticied a problem was in the crysis benchmark when applying AA which caused a detoriation in min fps and lots of stuttering when watching. I presume this is to do with lack of framebuffer, but maybe it was to do with the PCI-E bus...

All other games were fine though, particularly GRID, that runs a dream now at1920x1200 4xAA

http://forums.overclockers.co.uk/showthread.php?t=17894022&highlight=8800gtx
 
I have been asking this question for the last two weeks. Maybe not so much in realation to the 4870 as it shouldn't be that much affected but more so with the 4870x2.

What we need is somebody with two identical rigs baring one mobo is pci-e 1 and the other is pci-e 2 or two people with with same cpu and clock and different mobos.

Volunteers anybody?

Interesting to see GTX280 results as well.
 
Mortster said:
This might help as well, although it won't open properly at work, damn firewall

http://www.tomshardware.com/reviews/pci-express-2-0,1915-5.html
Click to expand...

so COD4 and FSX take a 7-10% hit with a GX2.

Does that mean a 4870 takes a bigger or lesser hit?

And my big question is the 4870x2. Since it looks like been ideally 100-115% quicker than a 4870 in games where xfire works well like cod4, I can really see that card been crippled by a pci-e 1.1 bus. Maybe 50%+ performance hit.
 
Greebo said:
I have been asking this question for the last two weeks. Maybe not so much in realation to the 4870 as it shouldn't be that much affected but more so with the 4870x2.

What we need is somebody with two identical rigs baring one mobo is pci-e 1 and the other is pci-e 2 or two people with with same cpu and clock and different mobos.

Volunteers anybody?

Interesting to see GTX280 results as well.
Click to expand...

Got a GA-X38-DQ6 coming for a bargain price soon so I'll be able to play and compare it against the P35 chipset :cool:
 
Greebo said:
And my big question is the 4870x2. Since it looks like been ideally 100-115% quicker than a 4870 in games where xfire works well like cod4, I can really see that card been crippled by a pci-e 1.1 bus. Maybe 50%+ performance hit.
Click to expand...

Yep there is bound to be a bigger impact than just a single 4870, and this is one of the reasons why I decided to go with it rather than wait out on an x2 and then find I need a new motherboard as well !
 
Not the best benchmark in the world but only managed to do limited testing:-

3DMark06 default - no AA/AF

16410 on an Asus Maximus Formula (PCI v2.0)
15626 on an Asus Commando (v1.0a)

So, 5% difference.

Everything else the same (cpu, mem, hdd etc) except the Maximus was @ 450x8 and the Commando @ 400x9 - shouldn't even make 1% difference tbh.

Maximus is coming back from RMA as we speak, so I'll get some benches done on the Commando with some AA/AF thrown in then do the same on the Maximus :-)
 
That's great. Games are the key though since 3dmark06 is already cpu limited to an extent.

cod4, crysis and dmc could be useful ones and maybe grid if you have it.
 
You don't need a second motherboard to test this out - all the X48 motherboards have compatability settings in the BIOS to force PCIe 1.1 or even PCIe 1.0.

In my simple testing, I dropped almost 2500 3DMarks with the board in PCIe 1.1 mode and a single 4850 on my JW-X48D2-Extreme (12000 vs 14500).

I obviously can't force the second PCIe slot into 4x mode (at least I can't see an option for it) so you would have to do a P35 vs X48 test and the chipsets just aren't the same.

From what I've seen it looks quite significant.
 
Overslop said:
I've read about the 4870 performing better in PCI-E 2.0 than PCI-E 1.1 because it needs more bandwidth than PCI-E 1.1 can provide at high resolutions with high setttings.

But I can't find info anywhere that states accurately how much of a benefit PCI-E 2.0 gives. Anyone have a link?
Click to expand...

None looks like the PCiI-e lane splitter chip is still v1.1 at least on the hardware making the rounds atm

http://www.pcper.com/article.php?type=expert&aid=590&pid=2

PCI sig confirms that the spliter chip the "PEX8647" PCI-e 1.1

http://www.pcisig.com/developers/compliance_program/integrators_list/pcie/

which seems abit sad to see
 
Last edited:
WJA96 said:
You don't need a second motherboard to test this out - all the X48 motherboards have compatability settings in the BIOS to force PCIe 1.1 or even PCIe 1.0.

In my simple testing, I dropped almost 2500 3DMarks with the board in PCIe 1.1 mode and a single 4850 on my JW-X48D2-Extreme (12000 vs 14500).

I obviously can't force the second PCIe slot into 4x mode (at least I can't see an option for it) so you would have to do a P35 vs X48 test and the chipsets just aren't the same.

From what I've seen it looks quite significant.
Click to expand...

i think u can force cards to 1x 4x speed or what ever using some tape on the connecter on the card it self
 
My new mobo's come today, need to test if it works first before testing mind :p

Will try and get some comparable benchmarks of P35 vs. X3/48 performance on the new ATI hardware.

Slightly OT: What's the best way of re-imaging an OS partition onto new motherboard chipsets without a full re-installation of Windows, with software such as Acronis etc.?
 
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