I had the same doubt, so I dig out a 1G ram and use only one 7950, but it seems the whole system only use like 1.1G of the total 3G ram I plugged in.

strange.....

and when I use 7850, on the screen it shows Accepted xxxxxxxxxx  for a long time before a
LONGPOLL detected new block shows up

but with 7950, it shows up very often.....

I did search everywhere I can but can't find an answer.

I have a 7950 (Powercolor) and a 7850 (XFX)
if I use 7850 alone, cgminer shows 349Kh/s while the pool (burnside's) also shows some value around 349Kh/s after maybe 10 mins
but if I change to 7950, cgminer shows 510.xx/Khs while the pool shows very from 1xx - 2xx something

I use  -I 17 for 7950 and -I 15 or 16 for 7850 when I do the tests and with both -w 128 and 256

          GPU Clock      Mem Clock      VDDC
7950    950              1200              1.0
7850    1000             1250              no change

and this only happen when I am mining litecoin.

am I missing anything? thanks

p.s. does it have anything to do with my system memory? I only plug a DDR2 2G memory

rfzBBUK3MiTSQbfVKyyP4jjxg9TKthrb5u

Finally learned why I can't reply to any post, 
I think this is my 6th post.

这个，没研究明白是怎么个意思

帮忙顶吧。

这第二批现在究竟神马状态了，这些天btcman上不去了，被DDos了？

有，但不在大连

原来是这样的，这回懂了