Mining speed depedence on memory speed. - page 2.

Between clocktweak and afterburner I've finally been able to lower the clocks on the memory of my 6870, but the results really have me confused. My understanding from other threads is that underclocking memory should have almost no effect on hashing speed. I found that not to be the case for my personal rig (2500k/Z68x-UD3H-B3/HIS6870), and I'm wondering what I'm doing wrong. Voltage, core and memory speeds were verified in both afterburner and GPU-Z, while power draw was measured at the wall with a P3 Kill-A-Watt

Code:

V Core Mem Mhash Watts MH/W
1.168 1000 300 260 163 1.595092025
1.168 1000 450 277 178 1.556179775
1.168 1000 525 290 182 1.593406593
1.168 1000 600 300 186 1.612903226
1.168 1000 700 310 191 1.623036649
1.168 1000 800 318 196 1.62244898
1.168 1000 900 320 201 1.592039801
1.168 1000 1050 321 206 1.558252427

I know that there is supposed to be a maximum spread with the 6xxx GPUs of 125 MHz between core and memory speed, but both GPU-Z and AB reported the speeds being set correctly. Is there another explanation for these results, and is there anything I can do so I don't lose 60MHash/s by underclocking my memory?

Topic: Mining speed depedence on memory speed. - page 2. (Read 2521 times)