Low hashrate on Gigabyte GV-R797OC-3GD rev 1.0 scrypt

[Mantikor]

Hi, i have x5 Gigabyte GV-R797OC-3GD rev 1.0, and only 550-580Kh/s via scrypt. Intensity - only 13 work, any other - drop down hashrate... I have tried -g 2 and every time it drops down to 380 Kh/s from 550 in -g 1. I try many conf also gpu: 900 - 1100 Mhz, memory: 900 - 1500Mhz, threadconcurrency 8192 - 22400, but see no difference. Try flash BIOS: F1, F2, F3 from Gigabyte, no results, with BIOS F72 and other Fxx - cards not start, this BIOS versions for rev 2.1 and not support memory type used in rev 1.0. What do you think? Thanx!

I want try flash BIOS from http://www.techpowerup.com/vgabios/123481/gigabyte-hd7970-3072-120628.html this BIOS support memory type used in my cards, maybe anyone run scrypt on Gigabyte GV-R797OC-3GD rev 1.0 and what version of BIOS are U use?

p.s. in sha256 mining cards work on 635Mh/s with no problem.

p.p.s system - Win7sp1x64, Catalyst 12.6, RAM 4Gb, setx GPU_MAX_ALLOC_PERCENT 100, setx GPU_USE_SYNC_OBJECTS 1
 - parameters set.

[albertdros]

Hi, i also have a gigabyte. Not yours but i have the 280x, but they might me very similar. Will pm u my cgminer settings. Getting around 700k with them

[Sharky444]

You need intensity of at least 18, better 19.

If hashrate is droping it may be either a cooling issue, or too low voltage.

[JCviggen]

Try 928/1600 or 957/1650 and drop the core voltage below default. I had a Gigabyte card at some point, memory didn't OC very well. Make sure memory voltage is 1.60V in Afterburner or Trixx, my card defaulted to 1.50V and memory overclocked poorly in general, limiting performance to around 660 Khash. My reference cards are all well above 700 khash with 1015/1750 settings. 0.58 core/mem ratio works best. Intensity 13.

[Mantikor]

You need intensity of at least 18, better 19.

If hashrate is droping it may be either a cooling issue, or too low voltage.

Try 928/1600 or 957/1650 and drop the core voltage below default. I had a Gigabyte card at some point, memory didn't OC very well. Make sure memory voltage is 1.60V in Afterburner or Trixx, my card defaulted to 1.50V and memory overclocked poorly in general, limiting performance to around 660 Khash. My reference cards are all well above 700 khash with 1015/1750 settings. 0.58 core/mem ratio works best. Intensity 13.

only 13 work's well, cooling ok, temp is 65-72, voltage default - 1.170V gpu & 1.6V mem, problem in BIOS, not propertly work parameter -g, if 2 - hashrate drop down, if 1 - works well, but 550Kh/s