Quote from: Reamer on March 12, 2014, 04:19:41 PM

Quote from: Starscream on March 12, 2014, 03:28:13 PM

Quote from: Panteraswift on March 11, 2014, 11:47:44 PM

I have two r9290 based rigs. Both required the same amount of system RAM as the sum of the RAM in all the installed GPUs, or in other words, if you have 2 r9290s each with 4 Gb of RAM, you will require 8 Gb of system RAM. This is due to the usually high TC value the 290s require to reach their full potential. All my 290s are hashing between 870 and 890.
In the other hand, Gigabyte R9 280x GPUs can get by with only one Gb of system RAM per GPU, due to the fact that those GPUs TC sweetspot is usually around 8192.

Quote from: grippy54 on March 12, 2014, 03:13:11 AM

I have 7 gigabyte R9 290s in 2 windows rigs. You MUST run 8gb RAM to get them going full speed. I had 4gb and they limped along. You can't turn up the TC or I without issues otherwise.

What the... I got 2 rigs with 3x R9 290 in each and each rig got only 4GB RAM and I'm hashing at 900KH/s (can get higher with higher core speed) with xint 400 on Windows.

Same here, I have a 4x Gigabyte 290 rig and it's running on 4GB ram. It gets ~900KH on scrypt and 450KH on vertcoin, but trying to run 2 GPU-threads will crash it.

Yea, R9 290 doesn't play well with -g 2.