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Topic: Can someone please tell me what I should be getting for KHS on the 7870 Ghz (Read 621 times)

legendary
Activity: 854
Merit: 1000
the 7870 has 1280, 7850 has 1024, makes no sense my 7850 is getting more than both my 7870's. Getting 400-405 on the 7850 and 390's on the 7870. I know what I wont be buying anymore..

Shaders don't mean crap once the bandwidth outruns them.  Both the 7850 and 7870 have roughly the same amount of bandwidth.  Your result is not unexpected.
sr. member
Activity: 256
Merit: 250
like one 7870 has a default gpu clock of 1050 and lowering it under its deault clock gets more khs, fucking shitty ass cards wtf
sr. member
Activity: 256
Merit: 250
the 7870 has 1280, 7850 has 1024, makes no sense my 7850 is getting more than both my 7870's. Getting 400-405 on the 7850 and 390's on the 7870. I know what I wont be buying anymore..
legendary
Activity: 854
Merit: 1000
7870 maxes out at 400-450khs.  You will not see 500khs on a 7870.  400khs is actually not a terrible result, i've seen far worse.

7870XT (7950 LE) will do 500khs with some tweaking.

7850 / 7870 / 7870XT all share the same 256bit memory interface with roughly similiar memory clock speeds.  This is why the 7850 is so close to the 7870 / 7870XT.

Extra shaders come into play as you go up the line (7870XT has 1536), but the extra shaders have extremely dimished returns as bandwidth / latency / memory amount available are more important than compute past a certain point.
sr. member
Activity: 840
Merit: 255
SportsIcon - Connect With Your Sports Heroes
I have a 7870 LE hashing at 510 Kh/s, 2 R9-270's @ 470 Kh/s and a shitty defective 7870 that can't go above 400.

Hashing speed depends on memory latency, as suspected by some and proven by TheStilt, a member of litecointalk forum and top overclocker/tweaker.
full member
Activity: 125
Merit: 100
Check out FireCoin!
500 seems high to me. Did you compare your config to other 7870's on the hardware list? Only one guy posted there above 425kh/s.

https://litecoin.info/Mining_hardware_comparison
sr. member
Activity: 256
Merit: 250
http://www.diamondmm.com/7870pe52gdd-diamond-amd-radeon-video-graphics-card.html

Only getting 400 khs and i thought i would get closer to 500 and its really starting to annoy me.

my 7850 pulls just as much, makes no sense
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