Topic: Presentation and hd7950 issues (Read 565 times)

Hi there, I'm not new to bit coin but I'm new here and well as I noticed I couldn't reply to topics about hd7950's I post it here !

I changed my gtx 6660 mining at 70 Mh/s to a hd7950 flex OC by sapphire (3gb) and set it at :
Vcore : 1,168V
Core : 1050MHz
Memory : 1500MHz

This first configuration, obviously not the best, made my co
Outer draw around 400W (i5 3450 @ 3,9GHz, 16gb corsair vengeance 1600MHz, vertex 4 and 3 HDD). But I didn't want to change trixx configuration to play games. After several black screens I understood that wasn't the best configuration.
I was making around 560MH/s with GUIminer. Windows 8 64 bits official. No flags.

Then the hash rate suddenly dropped to 415MH/s without any change of configuration.

I know have one game configuration with high memory clocks (1500 MHz) and moderated core clocks (1Ghz) and 1,05 v.

Mining config is now :
Core clock : 1150MHz (1175 isn't stable and 1200 crashes immediately)
Memory clock : 1000MHz (can't go under, it rises automatically to its default at 1250)
Vcore : 1,049 V (didn't try under, is it possible ??)

Flags : -v -w 256

Very stable, no crash in 36h and didn't stop it for desktop use (chrome, torrents, iTunes). Won't let it turn for HD movies watching or will add -s 0.05 flag.

Now working at 565 MH/s average but I'm a bit disappointed as I did the same with 100Mhz less and no flags just a month ago. I was doing aroun 0.05BTC/day and now, with difficulty rising ans ASICs coming, I'm under 0.02BTC/ day ...

Have any idea ?

As soon as today, in two months the 7950 payed for itself (made around 2 BTC) but not the electricity bill.