Hi, I have the Radeon HD 7950 card (model: XFX Double D FX-795A-TDFC).
I have both the memory clock and voltage set to default (1250Mhz and 1.250V). At 900 core clock I get 535Kh/s, at 1000 I get 555Kh/s, but when I try to raise the core clock past 1000 the Kh/s starts to lower for some reason. I tried putting the core clock to 1100 but then my Kh/s goes down to about 525Kh/s. Why is this?
I am modifying these values directly in cgminer, not some external overclocking program.
Here is my card:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150588&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=6153842&SID=qcu305g1cd2v