GTX 470/465 Fermi 2D Performance

[kazetsukai]

Hi all,

I upgraded from a pair of GTX260s to a GTX470 and later an additional GTX465. When I switched from 2x 260s to 1x470+1x260 I noticed huge problems with 2D performance. Scrolling in a web page on screenX/GPU1 will absolutely kill the framerate of a video running on screenY/GPU2, VDPAU or not.

As this workstation rig is mostly used as a DEV environment for web applications, it didn't bother me terribly, but I am getting sick of living with the issues. I upgraded the second 260 to a 465 (more or less the same chip as the 470, as opposed to the newer 460s) trying to resolve what could be compatibility issues, which fixed some non-performance related issues, but I'm still stuck with crappy 2D performance.

Anyone else having these issues with Fermi cards?

My setup:
Tyan S7025
2x Xeon E5520's, 7GB of RAM
1x GTX470
1x GTX465

NVIDIA Driver 275.09.07
Kernel 2.6.34.7-0.7

MTRR seems to be a problem, but even with kernel flags (enable_mtrr_cleanup, etc) I cannot seem to resolve them. The BIOS doesn't have the option either.

cat /proc/mtrr
reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg02: base=0x0bb800000 ( 3000MB), size=    8MB, count=1: uncachable
reg03: base=0x0bc000000 ( 3008MB), size=   64MB, count=1: uncachable
reg04: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back
reg05: base=0x200000000 ( 8192MB), size=  128MB, count=1: write-back
reg06: base=0x204000000 ( 8256MB), size=   64MB, count=1: uncachable

[Carmella]

I have experienced issues very similar to yours. I experienced major issues with 2D performance when I upgraded one of my 260's to a 465. Frustrated with the results I was experiencing from my so called upgrade, I decided to go ahead and get a second 465. This resolved the issues I was having. It seems through my experience, that there are quite possibly compatibility issues from running two different cards.