Overclocking 5830's, hashrate won't go up

[Faraday]

Hi there, today i've been trying to OC my 5830's but the problem is its always getting around 277-280 khash/sec
this is from about 920mhz - 1025mhz (which froze after 10mins)

reading other peoples posts they seem to be getting 300+ with clocks of 975MHz and up.
I have tried different miners and different settings on all of them, nothing seems to make the hash rate any higher its always around that same mark with some changes in config making it drop a bit.

Is there a bottleneck in my system?

I'm running this on Linuxcoin v0.2a off a USB drive. system specs are..

AMD Sempron Processor 140 2.7GHz
Antec 620W ATX NEO ECO PSU
Kingston ValueRAM 1GB 1333MHz DDR3 Non-ECC CL9 DIMM
MSI 870A-G46 AM3 AMD 870 ATX AMD MBD
2x Sapphire HD5830 Extreme 1G GDDR5 256bit PCI-E Video card

Does anyone have any idea why i cant get over 280kh/sec? I have gone back to 875/225 for the time being which gets me 255khs (sick of the extreme fan noise, will put in another room once i get it oc'd properly)

[1715228729]

1715228729

[1715228729]

1715228729

[1715228729]

1715228729

[1715228729]

1715228729

[SolidBitShop]

First of all what is your OS second what do you use to mine (what miner gui miner, phoenix etc)

For my configuration is:

Win7 64bit

- dfi lan party dk 790fxb-m3h5
- ozc zx-series 1kW
- 2GB ram ddr3 (like noname - dont buy cheap ones ... i have learned my lesson for the future)
- Sata hdd
- 3xsaphire radeon 5830 extreme
- 2x120mm fans pulling out air at the back end of the cards (help  with -5 deg.C)

Phoenix 1.5 phatk SDK 2.4 newest catalyst

-k phatk DEVICE=x BFI_INT VECTORS AGGRESSION=13 (More than 13 somehow slowers the #)

GPU1 970/375 - Temp. 75st FAN 63 % 301.93 M#
GPU2 970/375 - Temp. 78st Fan 72 % 300.50 M#
GPU3 970/375 - Temp. 78st FAN 76 % 301.23 M#

M# varries + 2 - 1 hot as hell dont hink it is wise to overclock them more.

ok. sorry i have missed that you are running it on linux. cant help thou.

After I set the circulator on to the Cards I got - 10 deg. C. temperature drop.

[Zagitta]

It's most likely your miner flags that's to blame... as said by Kraken try and use these flags: -k phatk DEVICE=x BFI_INT VECTORS AGGRESSION=13