PCI-E 2.0 variable performance in drivers

P45 should not have this problem, so you're good. The problem can appear only on P55, X58 chipset from what I heard.

 

Gigabyte P55A-UD3
ATI 10.9a

 

Yep - Windows 7 Ultimate x64

 

So now you are getting way better numbers than I! LOL

I am maxing out at just above 3GB/sec either way.

EDIT: Nevermind - just ran it again with the latest intel chipset drivers and am getting 6GB/sec+ in both directions. All is good.

 

So that solves it then. It is a driver issue conflict with Intel Chipsets. So it seems 10.9a solved it.

I also found out for mobile users, the Intel Chipset PCI-E 2.0 is limited at 2.5 gb/s

So both mysteries solve

 

happy you solved it.Im on win 7 64 and official ati 10.9 drivers.

 

This won't have an effect on games?

 

Yse I do.

 

both 10.9 and 10.9a gives me 6 gb/s instead of 700 mb ^^ But what exactly does it mean?

 

Woooooooohoohooou Dooouble Raaainbow....

 

i'm serious, can anybody tell me what it means? i'm using 10.3 right now, but with 10.9 and 10.10 I get a 6 Gb/s instead of .7 Gb/s, pretty significant difference, so I'm very curious

 

6 or 7 Gb/s is ok.
Anyway it only applies for applications that can use GPGPU.

 

I get awful performance in this test

I have 2 x 5850 crossfired on catalyst 10.10 on linux (but I tried under Windows and 10.10a drivers and the situation is similar) and the results are these :

[hades@artemis PCIeSpeedTest_v0.2]$ ./PCIeSpeedTest
Devices found: 2

===> Testing device 0 <===
Device type: Unknown
Max resource 2D width/height: 16384/16384
Total GPU memory size: 1024 MB
Total CPU cached space size: 508 MB
Total CPU uncached space size: 1788 MB
GPU engine clock: 0 MHz
GPU memory clock: 0 MHz
Number of timing loops: 100
[ 16 bytes] CPU->GPU= 400.000 KB/sec, GPU->CPU= 533.333 KB/sec
[ 32 bytes] CPU->GPU= 1.600 MB/sec, GPU->CPU= 1.600 MB/sec
[ 64 bytes] CPU->GPU= 1.067 MB/sec, GPU->CPU= 2.133 MB/sec
[ 128 bytes] CPU->GPU= 6.400 MB/sec, GPU->CPU= 4.267 MB/sec
[ 256 bytes] CPU->GPU= 5.120 MB/sec, GPU->CPU= 1.707 MB/sec
[ 512 bytes] CPU->GPU= 17.067 MB/sec, GPU->CPU= 25.600 MB/sec
[ 1024 bytes] CPU->GPU= 34.133 MB/sec, GPU->CPU= 51.200 MB/sec
[ 2048 bytes] CPU->GPU= 29.257 MB/sec, GPU->CPU= 102.400 MB/sec
[ 4096 bytes] CPU->GPU= 136.533 MB/sec, GPU->CPU= 204.800 MB/sec
[ 8192 bytes] CPU->GPU= 409.600 MB/sec, GPU->CPU= 273.067 MB/sec
[ 16384 bytes] CPU->GPU= 819.200 MB/sec, GPU->CPU= 819.200 MB/sec
[ 32768 bytes] CPU->GPU= 1.092 GB/sec, GPU->CPU= 819.200 MB/sec
[ 65536 bytes] CPU->GPU= 385.506 MB/sec, GPU->CPU= 728.178 MB/sec
[ 131072 bytes] CPU->GPU= 2.185 GB/sec, GPU->CPU= 485.452 MB/sec
[ 262144 bytes] CPU->GPU= 1.092 GB/sec, GPU->CPU= 624.152 MB/sec
[ 524288 bytes] CPU->GPU= 2.497 GB/sec, GPU->CPU= 563.751 MB/sec
[ 1048576 bytes] CPU->GPU= 2.140 GB/sec, GPU->CPU= 606.113 MB/sec
[ 2097152 bytes] CPU->GPU= 2.411 GB/sec, GPU->CPU= 609.637 MB/sec
[ 4194304 bytes] CPU->GPU= 2.527 GB/sec, GPU->CPU= 614.100 MB/sec
[ 8388608 bytes] CPU->GPU= 2.581 GB/sec, GPU->CPU= 621.378 MB/sec
[ 16777216 bytes] CPU->GPU= 2.617 GB/sec, GPU->CPU= 630.012 MB/sec
^C^C
[hades@artemis PCIeSpeedTest_v0.2]$ ^C

 

Any examples of applications that does?

 

Look here:
http://forums.guru3d.com/forumdisplay.php?f=22