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 2512 times)