Sapphire HD3870X2 Low performance

[gOtVoltage]

[QUOTE=MadDias;2785229]the bandwidth reported in gpu-z has nothing to do with the pcie bandwidth...
i can show u a ss of gpu-z on my 2900 @ 8x with a bandwidth of 115gb/s.
the bandwidth shown in gpu-z is only the video ram bandwidth and is affected by the vram clocks and the memory interface.

kotz´s bandwidth is that low, cause gpu-z is using the 2d-clocks of his card to calculate the bandwidth, not the real 3d-clocks.

[QUOTE=gOtVoltage;2785131]
Note:The 3870x2 @CPU2300mhz is suppose to do better than 12600+. [QUOTE]

note that he has an amd... cpu scores around 3k aren´t possible with a amd x2 processor. i´m still convinced that his 10k score (with stock cpu and gpu clocks) is absolutely correct and nothing wrong with it.

[QUOTE=gOtVoltage;2785131]Remeber @ 256mb = 28.8 GB/s 12500+3Dmark06 is with half the Bandwidth of 512mb NOT 1024mb..Also @ 512mb = 57.7 GB/s you would see 13600/14000+ @2300x4Cpu

what do u mean? more memory, more bandwidth?? not at all...
there is a big difference in bandwidth between a 256bit and a 512bit memory interface. but theoreticaly a 256mb card with a 512bit memory interface can have a higher bandwidth than a 512mb ard with only a 256bit interface.




a 3870x2 doesn´t have a frame buffer of 1024mb. each gpu can only use 512mb of vram. u cannot simply add the vram on the card.
and a hd3870 card with a bandwidth of 114gb/s is hard to find it just doesn´t have the 512bit mem interface of the older 2900 cards. so the bandwidth will always be lower.

What i was saying EXACTLY is a 3870x2 has 57.7GB/s per 512mb of memory at 100%GPU usage..

This in return translates to a total BW or 114GB/s no matter what..

Any One has a 3870x2 with a proper CPU-Z that reads the REAL 57.7GB/s..That is the TOTAL GB/s per 512mb and 1GPU(Not Crossfire) In Crossfire mode this gets multiplied by 2!!!!.Two GPU's and 1mb of memory really is 114gb/s when in CROSSFIRE!..When you overclock the Card say to 900/1100 you should get 70gb/s or more for a Half or 140GB/s for CROSSFIRE both GPU's running 100%..

EXAMPLE :8800GTS has 57.7gb's stock! thats with 256bit. 3870x2 has 2x256bit with 2x57.7GB/s (that means 512mb x 2 in CROSSFIRE MODE 2GPU enabled..


I am in no way making numbers up! The card DOES IN FACT run at 114GB/s for its overall total @100% GPU usage In CROSSFIRE EACH GPU uses 512mb = 57.7GB/s stock clocks this means 2xGPU + 2x512mb = 114GB/s and even way higher when Overclocked.

If you are able to read the REAL GB/s with CPU-Z(NOT 28.8GB/s) for both cores you will see what im talking about GB/s wise.