Problem with two r9 280x toxic - first card is slower

[papaya]

Hi everybody,

I have a strange problem with those cards.

The card with a monitor has a ~100kH/s lower speed than the other card:
See: http://up-pic.de/images/img134/1583r9280x.png

I don't know what I have changed... (BIOS, VBIOS, Windows, etc...)
But at the first time i tried out these cards, both runs at ~760kH/s

I've reset the MB Bios, Card Bios and set up a new windows. But it's still the same.

Maybe you have an idea what's wrong here...

My HW:

- MSI 7816-001R Z87-G43 Intel Z87 Mainboard Sockel LGA 1150 (4x DDR3, Intel HD Graphics, 2x PCI-e, 6x SATA, ATX)
- Kingston KHX1600C9D3B1/4G RAM 4GB (1600 MHz, CL9) DDR3-RAM
- 2x Sapphire R9 280X 3GB Toxic (PCI-e, 3GB GDDR5, HDMI, DVI, 1 GPU)
- Intel BX80646G3220 Pentium G3220 (3GHz, LGA 1150, 3MB Cache, 54 Watt)

SW:

- Windows 7 Pro SP1 (with all updates)
- Catalyst 13.251-131206a-166389C-ATI
- TightVNC Server
- CGMiner 3.7.2

My Config:
(cgminer.conf)

Code:

{
"pools" : [
	{
		"url" : "stratum+tcp://eu.multipool.us:7777",
		"user" : "",
		"pass" : "x"
	},
	{
		"url" : "stratum+tcp://us-east.multipool.us:7777",
		"user" : "",
		"pass" : "x"
	}
]
,
"intensity" : "13,13",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,2",
"thread-concurrency" : "8192,8192",
"shaders" : "0,0",
"gpu-engine" : "1090-1090,1090-1090",
"gpu-fan" : "0-85,0-85",
"gpu-memclock" : "1500,1500",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "0,0",
"gpu-threads" : "2,2",
"gpu-vddc" : "1.100,1.100",
"temp-cutoff" : "95,95",
"temp-overheat" : "85,85",
"temp-target" : "68,68",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-switch-delay" : "30",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"log" : "5",
"log-dateformat" : "0",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

(run.bat)

Code:

set GPU_MAX_ALLOC_PERCENT=100
set GPU_USE_SYNC_OBJECTS=1
cgminer

Best regards

[nytrolic]

Wrong sub forum, maybe try posting here: https://bitcointalk.org/index.php?board=160.0

[elchorizo]

Set your resolution on the display to as low as possible and see if your hash rate increases. I use these at the top of my shell script that I start cgminer with:

Code:

export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
xrandr -s 800x600

For you, the xrandr might make a difference.

[papaya]

Set your resolution on the display to as low as possible and see if your hash rate increases. I use these at the top of my shell script that I start cgminer with:

Code:

export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
xrandr -s 800x600

For you, the xrandr might make a difference.

ehm. my operating system is windows, not linux.

but changing the resolution doesn't help.

[elchorizo]

Set your resolution on the display to as low as possible and see if your hash rate increases. I use these at the top of my shell script that I start cgminer with:

Code:

export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
xrandr -s 800x600

For you, the xrandr might make a difference.

ehm. my operating system is windows, not linux.

but changing the resolution doesn't help.

I don't mine on Windows but I have seen a couple tidbits that might help... ULPS on Windows could be causing it:

https://litecointalk.org/index.php?topic=9441.0
http://www.overclock.net/t/667144/crossfire-disabling-ulps
http://www.sevenforums.com/tutorials/316913-ulps-ultra-low-power-state-disable-amd-crossfirex.html