Nv40, Nv3x, R300, R420 users, Question Please

The program gives a 100% cpu load on my 2400Mhz Barton, but it doesn't seem to be cpu limited when you look at the results on different agp clocks.

Anyway, Ti4400 running default ( 275/550 ) 40.72 Detonator
Agp 4x, Fast writes enabled.

Agp frequency 66mhz on NF7

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  36.5254 Mpix/s  109.576 MB/s
Format: 02 - Speed:  36.4599 Mpix/s  145.839 MB/s
Format: 03 - Speed:  36.7002 Mpix/s  110.1 MB/s
Format: 04 - Speed:  37.0934 Mpix/s  148.374 MB/s

Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  36.5691 Mpix/s  109.707 MB/s
Format: 02 - Speed:  36.7002 Mpix/s  146.801 MB/s
Format: 03 - Speed:  36.9623 Mpix/s  110.887 MB/s
Format: 04 - Speed:  36.9623 Mpix/s  147.849 MB/s

Now 76Mhz Agp clock

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  40.6323 Mpix/s  121.897 MB/s
Format: 02 - Speed:  41.1257 Mpix/s  164.503 MB/s
Format: 03 - Speed:  41.8726 Mpix/s  125.618 MB/s
Format: 04 - Speed:  41.4188 Mpix/s  165.675 MB/s

Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  41.3969 Mpix/s  124.191 MB/s
Format: 02 - Speed:  39.9387 Mpix/s  159.755 MB/s
Format: 03 - Speed:  41.4624 Mpix/s  124.387 MB/s
Format: 04 - Speed:  41.3095 Mpix/s  165.238 MB/s

And finally 86Mhz Agp clock

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  45.4601 Mpix/s  136.38 MB/s
Format: 02 - Speed:  45.2417 Mpix/s  180.967 MB/s
Format: 03 - Speed:  45.7556 Mpix/s  137.267 MB/s
Format: 04 - Speed:  46.1592 Mpix/s  184.637 MB/s

Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  46.2247 Mpix/s  138.674 MB/s
Format: 02 - Speed:  46.6398 Mpix/s  186.559 MB/s
Format: 03 - Speed:  46.0281 Mpix/s  138.084 MB/s
Format: 04 - Speed:  46.0937 Mpix/s  184.375 MB/s

Hope this helps.
 
Ilfirin said:
...

SSE2 ....

<Relatively high transfer rates (for both cards)>
Click to expand...

Noticing a trend?
Click to expand...

Yup, it seems SSE2 is the thing, or it could be a CPU model thing. Probably hitting a fast path for such a config. It would be interesting to see what the source looks like, if it's doing anything odd, because it's not only about the speed at which things are read back over the AGP bus, but also about assembling the data into the requested output format. The driver may have to swizzle stuff around in software.
 
To ellingsen1, Rys, pino and lowdog,

Could you post your system specs, such as processor, chipset and motherboard, please? I'm very interested to see if the high readback speeds have anything to do with Intel's PAT.

Thanks everybody,
Drak
 
Vendor: ATI Technologies Inc.
Version: 1.5.4391 WinXP Release
Renderer: RADEON 9700 PRO x86/SSE2


Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed: 28.6611 Mpix/s 85.9832 MB/s

Format: 02 - Speed: 28.0494 Mpix/s 112.198 MB/s

Format: 03 - Speed: 29.0761 Mpix/s 87.2284 MB/s

Format: 04 - Speed: 28.2242 Mpix/s 112.897 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed: 29.0761 Mpix/s 87.2284 MB/s

Format: 02 - Speed: 28.1586 Mpix/s 112.635 MB/s

Format: 03 - Speed: 29.0543 Mpix/s 87.1629 MB/s

Format: 04 - Speed: 28.0931 Mpix/s 112.372 MB/s


ATI 9700 Pro 375/325 (Catalyst 4.6)
1.5 Ghz PC1066 RDRAM
3.06 GHz P4 w/ HT
Intel 850e mobo
 
Drak said:
To ellingsen1, Rys, pino and lowdog,

Could you post your system specs, such as processor, chipset and motherboard, please? I'm very interested to see if the high readback speeds have anything to do with Intel's PAT.

Thanks everybody,
Drak
Click to expand...

AMD Athlon FX-51 @ 2.8GHz (14 x 200)
ASUS SK8V (VIA K8T800)
1GB Corsair XMS3500RE Registered DDR @ DDR400, 2-3-2-6

Rys
 
Drak said:
To ellingsen1, Rys, pino and lowdog,

Could you post your system specs, such as processor, chipset and motherboard, please? I'm very interested to see if the high readback speeds have anything to do with Intel's PAT.

Thanks everybody,
Drak
Click to expand...

61.71 drivers. No oc'ing on any hardware.

Abit IC7 MAX3 / P4 3.4C / Geil 3500ULD 4x512meg sticks @ 2.5-3-3-7 (btw PAT is disabled on the IC7 MAX3 when using all 4 dimm slots).
 
The test was run on a P4P800D (Intel 865PE) using a 3.2C at 3.68. The FSB was running at 230 with the memory in sync. mode (1:1) 460DDR CAS 3,3,3 and the AGP locked at 66MHz.

If you want another bench at a diff. speed let me know. My rig is stable up to 3.84 240 FSB. I mostly leave it at 3.68 because it does not require any additional voltage to the CPU to run at that speed.
 
Thanks Rys and lowdog,

So it seems that the high readback speed is not attributable to only the P4 nor Intel PAT. It's good to know that it's also available on the Athlon FX (maybe Opteron?). Has anyone tried the benchmark on an Intel 815/845, nForce2/3 or other chipset?

I was thinking of using all four DIMM slots on an IC-7 board. It's good to know that I won't get PAT (not that it will make a big difference, will it?)
 
Thanks ellingsen1. Rebenching won't be necessary.

I wanted to get platform details because I need to build a GPGPU rig at work. I need the readback bandwidth because I'm competing against the Field Programmable Gate Array (reconfigurable hardware) of a mate of mine.

edit: typo
 
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