Is there an optimal driver version to be using? I had another system that seemed ‘normal’ with ~1.4GB/sec with pagged memory and ~3.XGB/sec with pinned memory. – this is using the bandwidthTest program.
I setup this new system… 8800GTS in a x16PCIe2.0 slot… though it should just be running at generic PCI1.0 speed, correct? Only the new G92 8800s support PCI 2.0, correct?
Quick Mode
Host to Device Bandwidth for Pageable memory
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 2425.5
Device to Host Bandwidth for Pageable memory
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 2441.2
Device to Device Bandwidth
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 4379.7
These scores seem weird, why is dtod so slow?
If I try using pinned memory I get no results:
C:\Documents and Settings\Administrator\Desktop\bandwidthTest1\NVIDIA CUDA SDK\bin\win32\Release>bandwidthTest.exe --memory=pinned
Quick Mode
Host to Device Bandwidth for Pinned memory
C:\Documents and Settings\Administrator\Desktop\bandwidthTest1\NVIDIA CUDA SDK\bin\win32\Release>
Another odd thing is I get dtoh to above 4GB/sec…
C:\Documents and Settings\Administrator\Desktop\bandwidthTest1\NVIDIA CUDA SDK\bin\win32\Release>bandwidthTest.exe --memory=pageable --mode=shmoo --dtoh
Shmoo Mode
Device to Host Bandwidth for Pageable memory
…
.
Transfer Size (Bytes) Bandwidth(MB/s)
<>
14757888 1024.9
15806464 1116.3
16855040 1206.3
18952192 1271.2
21049344 1518.3
23146496 1378.4
25243648 1827.9
27340800 1970.0
29437952 2141.3
31535104 2242.4
33632256 2390.2
37826560 2749.4
42020864 3024.4
46215168 3340.9
50409472 3522.2
54603776 3936.1
58798080 4212.1
62992384 4522.8
67186688 4761.9
&&&& Test PASSED
Press ENTER to exit…
C:\Documents and Settings\Administrator\Desktop\bandwidthTest1\NVIDIA CUDA SDK\bin\win32\Release>bandwidthTest.exe --memory=pageable --mode=shmoo --dtoh
How does it hit 4761MB/sec?
Not sure how to interperate these results. I’m not getting any warnings of any problems or anything… but something clearly isn’t right. I’ll have a 8800GT tomorrow as well. Will bandwidth on a PCIe2.0 card in a PCIe2.0 slot be significatnly higher?
thanks for any ideas