lower hash with sgminer vs. cgminer

[Degolep]

Code:

{
"intensity" : "13",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "8192",
"shaders" : "2048,",
"api-port" : "4028",
"expiry" : "1",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "1",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

4x 280x 1020/1500 I get 2860Mh/s with cgminer and only 2150Mh/s with sgminer?

I've tryed messing around with core speed and different kernels and there is no improvement....

[jazarja]

try set your thread concurrency with 8193 and xintensity to 4

[Degolep]

doesn't help...

[grippy54]

That's odd. I've heard the sgminer generally gives higher hash.

[Degolep]

I don't have a clue whats going on it should be the same since sgminer is based on cgminer...