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Author Topic: Help | Corsair CX750w + 2xR9 290 CRASH!  (Read 444 times)
gilad215
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March 03, 2014, 10:26:08 AM
 #1

hey guys.

a month ago i bought a rig with a corsair cx750 and 2x290. it worked perfectly at 830khash and powertune+20 for a month.
didn't know back then that probably the psu isn't strong enough and the rig started to crash a week ago after 10 min of mining.
i lowered the powertune to zero but it still crashes!
can there be any other reason for the crashing? anyone else expiriencing this?
i'm really annoyed by this there must be a way to get it working until i get a new psu.

thank you guys!

Neluns
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Starscream
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March 03, 2014, 10:38:43 AM
 #2

Did you undervolt? a 750w can be enough for 2x R9 290 (and of course mobo+ram+cpu) if you set it correctly and go a bit conservative with the settings.

Anyway, post your settings here.
NameTaken
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March 03, 2014, 10:56:09 AM
 #3

You should get an electricity monitor. If your PSU is at 100% capacity, it would be drawing 910W from the wall. You can also set your powertune to -20.
gilad215
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March 03, 2014, 11:26:53 AM
 #4

those are my settings. STOCK!
Quote
-g 1 -w 512 --lookup-gap 2 --thread-concurrency 32765 -I 19 --gpu-fan 85 --gpu-engine 947 --gpu-memclock 1250 --temp-overheat 92 --temp-cutoff 96

its so weird the rig worked for couple of weeks smooth with powertune+20! it means that the psu should do the job right? now when i'm on zero it crashes!
please help..

forgot to mention. when the rig crash, i can't power it on i need to unplug the AC and plug it again. and the motherboard lid is still on after the crash.

Neluns
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Starscream
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March 03, 2014, 11:44:40 AM
 #5

those are my settings. STOCK!
Quote
-g 1 -w 512 --lookup-gap 2 --thread-concurrency 32765 -I 19 --gpu-fan 85 --gpu-engine 947 --gpu-memclock 1250 --temp-overheat 92 --temp-cutoff 96

its so weird the rig worked for couple of weeks smooth with powertune+20! it means that the psu should do the job right? now when i'm on zero it crashes!
please help..

forgot to mention. when the rig crash, i can't power it on i need to unplug the AC and plug it again. and the motherboard lid is still on after the crash.

It's not that weird. If memory serves me right, than at stock values a single R9 290 eats about 330w-350w, 2 of those will make it 660w-700w and when you add cpu, mobo and ram on top of it you exceed the limits of your PSU. A quality PSU can provide more power than it lists as, but it's not meant to exceed its limit for long periods of time (weeks in your case).

I can't say for sure if your PSU is toast, but try undervolting your R9 290 with stock clock speeds and see what you get.

A really conservative settings I used to have were 911/1250 with voltage down to 1.023v, those gave me like 225w per card but hashed at like 800KH/s.
gilad215
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March 03, 2014, 11:52:10 AM
 #6

those are my settings. STOCK!
Quote
-g 1 -w 512 --lookup-gap 2 --thread-concurrency 32765 -I 19 --gpu-fan 85 --gpu-engine 947 --gpu-memclock 1250 --temp-overheat 92 --temp-cutoff 96

its so weird the rig worked for couple of weeks smooth with powertune+20! it means that the psu should do the job right? now when i'm on zero it crashes!
please help..

forgot to mention. when the rig crash, i can't power it on i need to unplug the AC and plug it again. and the motherboard lid is still on after the crash.

It's not that weird. If memory serves me right, than at stock values a single R9 290 eats about 330w-350w, 2 of those will make it 660w-700w and when you add cpu, mobo and ram on top of it you exceed the limits of your PSU. A quality PSU can provide more power than it lists as, but it's not meant to exceed its limit for long periods of time (weeks in your case).

I can't say for sure if your PSU is toast, but try undervolting your R9 290 with stock clock speeds and see what you get.

A really conservative settings I used to have were 911/1250 with voltage down to 1.023v, those gave me like 225w per card but hashed at like 800KH/s.

thank you my friend. it seems i need to change my PSU.
i tried now your settings and i get around 700KH/s. maybe i can push it to 750? what would you change to make it stable

Neluns
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Pre-sale on Aug, 1
Starscream
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March 03, 2014, 12:29:32 PM
 #7

those are my settings. STOCK!
Quote
-g 1 -w 512 --lookup-gap 2 --thread-concurrency 32765 -I 19 --gpu-fan 85 --gpu-engine 947 --gpu-memclock 1250 --temp-overheat 92 --temp-cutoff 96

its so weird the rig worked for couple of weeks smooth with powertune+20! it means that the psu should do the job right? now when i'm on zero it crashes!
please help..

forgot to mention. when the rig crash, i can't power it on i need to unplug the AC and plug it again. and the motherboard lid is still on after the crash.

It's not that weird. If memory serves me right, than at stock values a single R9 290 eats about 330w-350w, 2 of those will make it 660w-700w and when you add cpu, mobo and ram on top of it you exceed the limits of your PSU. A quality PSU can provide more power than it lists as, but it's not meant to exceed its limit for long periods of time (weeks in your case).

I can't say for sure if your PSU is toast, but try undervolting your R9 290 with stock clock speeds and see what you get.

A really conservative settings I used to have were 911/1250 with voltage down to 1.023v, those gave me like 225w per card but hashed at like 800KH/s.

thank you my friend. it seems i need to change my PSU.
i tried now your settings and i get around 700KH/s. maybe i can push it to 750? what would you change to make it stable
Well, I also got R9 290 with HynixAFR, so it might have account for the difference in speeds you and me get (in case you don't have HynixAFR youself).

I suggest for you to set back the voltage to its original value and than play with the core and mem speeds, once find KH/s you like, start undervolting. You could always go the reverse route if you wish - set a certain voltage (never set it above stock!) and than find the optimal core/mem clock speeds that give you the most KH/s.

You can start by trying mine: 1015/1250 with 1.070v - those give me 900KH/s with 275w usage.

But I wanna emphasize again that if you got different memory type (Elpida or HynixMFR) than my clock speeds would probably net you different results, most likely worse so you'll need to do some trial and error until you find the sweet spot.
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