Quote from: m50b25 on March 26, 2014, 06:35:36 AM

Quote from: wacko on March 25, 2014, 07:12:20 PM

m50b25 Probably not enough ram. If you've got another 4 GB lying around, try adding it to this system and see whether hashrate goes up.. you should have 360+ KHash/sec at those clocks. I've got 355K from 7970 @ 1000/1250, so your 1080/1500 should give more.

I could just borrow 4 gb from one of my other rigs just to try that. Thanks

Quote from: JohnnyDaMitch on March 25, 2014, 09:14:05 PM

Quote from: m50b25 on March 25, 2014, 06:57:38 PM

Hello everybody

I have 4 Powercolor 280x turboduo.

I cant get the cards over 291 kh/s each. Something very strange about my cards i that i have to set gpu thread 1 instead of the usual gpu thread 2 i use when mining other scrypt coins.

I have GA-F2A85X-UP4, Amd A4-5300 and 4 gb ram.

Any ideas what i should try? I have tried to play around with the gpu core speed. I still dont get over 291 kh/s
...

Using -g 2 with -I 13 should always be possible on a 280x, I think. Your engine clock is possibly way too high for it. Did you try changing the thread concurrency + or - 1 (8191 or 8193)? One other thing that has occasionally been useful for me is to try different Catalyst versions.

You didn't say what kind of error or failure you were getting when attempting -g 2.

edit: oh yeah, try worksize 128 too.

I know. I should be able to use -g 2. Yes i already tried using thred concurrency 8191 and 8193. I usually use 8193 when mining other scrypt coins. I will try lowering the core speed but i seriously doubt it will do anything because i already tried lowering to 1030 mhz.
With that config i have and using -g 2 i get 745 kh/s when mining ltc. And the cards are stable for weeks.
I will post later today what kind of error i get in vertminer when using -g 2

No luck at all. I was able to use -g 2 with 8gb ram but i dont get any better hashrate. It just gets worse. I have tried just about every setting i can find. different tc, core speed, memory, intensity, lookup-gap. Yeah you name it.

Here is someone who posted in this thread at page 41. He got 4x powercolor 280x turboduo just like me. I tried his config. Stil not getting any better hashrate.
https://bitcointalk.org/index.php?topic=416572.msg5430886#msg5430886

Here are two pictures of cgminer and config with -g2 and -g 1
The rig was running about 20 minutes with each config.

-g 2

http://i.imgur.com/Uj8v3cv.png

-g 1

http://i.imgur.com/rA9u8P1.png