This is a BTC forum, but seeing that nobody can read and/or don't care... I'll respond anyways...
Make sure you're powering your cards from SEPARATE RAILS, and that you're ensuring each card has enough power (COUNT how many +12v wires are going from your PSU to your card, since each line can only carry so much load). It doesn't matter if you ahve a 1250w PSU if you're loading multiple cards on a single rail. The Seasonic 1250 has 4 rails, you should have no more than one car per rail.
Also, post your settings. For LTC, you should be undervolting your GPUs so that you draw less power.
I have 2x 7870's in a standard PC tower, both running very quiet, at a smooth 363 kh/s, <75C, ~1500 fan speed. Undervolting will help reduce load on all your components and reduce heat/noise as well. No effect on hash rate either.
Topic: help 2 x 7970 going faster than 3 x 7970 (Read 627 times)
Try this
{
"pools" : [
{
"url" : "stratum+tcp://xxxxx:3333",
"user" : "xxxx",
"pass" : "xxxx"
},
{
"url" : "stratum+tcp://xxxxx:3333",
"user" : "xxxx",
"pass" : "xxxxx"
}
]
,
"intensity" : "19",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "22400",
"shaders" : "2048",
"api-port" : "4028",
"expiry" : "120",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
{
"pools" : [
{
"url" : "stratum+tcp://xxxxx:3333",
"user" : "xxxx",
"pass" : "xxxx"
},
{
"url" : "stratum+tcp://xxxxx:3333",
"user" : "xxxx",
"pass" : "xxxxx"
}
]
,
"intensity" : "19",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "22400",
"shaders" : "2048",
"api-port" : "4028",
"expiry" : "120",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
What are your temperatures? Could the cards possibly be throttling back automatically due to how hot they are getting as a result of the added cards? Also, did you install new drivers or any other software that might have changed hash rates with the cards?
By any chance did you buy Sapphires VApor-X 7970, if so you gotta flash the bios to go into the 750 kh/s range
the PSU should have enough power. Try to make adjustment to your settings
Yeah, i have tried everything, perhaps 8gig of ram is not enough for 3 cards?
the PSU should have enough power. Try to make adjustment to your settings
this is weird, i have always just had 2 x 7970 hashing away at 740kh each in my rig. So now I've updated to 3 x 7970 all the same brand and model they will only hash at 640kh each ? this is using the same settings in cgminer and msi afterburner.
What is happening with that? the psu are 1250W so should be enough power easily?
What is happening with that? the psu are 1250W so should be enough power easily?
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