Forum regular here, who was referred to this section of the forum by nVidia customer care in an attempt to narrow down or resolve a strange issue.
Have any of you CUDA aficionados had ever seen an issue whereby on cold boots a GTX 295 Single PCB can potentially have poor CUDA performance and suffer from a general degradation in gaming performance. On these cold boots CUDA-Z measures a drastic reduction in Device to Host and Host to Device Transfer Speeds.
Here are screenshots of CUDA-Z which I hope explain my findings in more detail.
Here we see on an occasional COLD Boot the GTX 295 has horrid performance
Here on a usual warm boot the GTX 295 is performing adequately
Has anybody seen this issue before? If so what was the cause and how did you resolve it?
The only way I have found to resolve this issue is to power the PC off (not reboot) and leave it for 20seconds before powering it back on. Rebooting sets the GTX 295 into a “half crippled mode” where it is operating @ 27xxMB/s as opposed to the 48xx MB/s
Core2 Quad Extreme QX9650
8GB of DDR3 @ 1333Mhz CL9
ASUS P5E3 (X38) Motherboard with latest BIOS 1503
nVidia Geforce GTX 295 Single PCB edition.
Creative X-Fi Fatail1ty Sound Card.
2x 80GB X-25M SSD’s in RAID0
1WD Velociraptor 300GB
Enermax Infiniti 720W PSU
Windows 7 Ultimate x64
Any advice you have to offer would be most appreciated.