Opinions: Is a Corsair TX750 enough for four HD 5830s?

[mouser98]

dedicated mining rig:  biostar A870U3 mobo, Sempron 140 cpu, 2 gig ddr300 mem, 4 sapphire radeon hd 5830s, oc'd to 875,900

is the Corsair tx750 enough power for it?

if not, what symptoms will i notice?

[CubedRoot]

You will be cutting it close I think. I am running 3 HD5850's and a HD5870 in my rig and 750 wasnt nearly enough.  WHen I added the 5870 it killed it. LOL.

I ended up going with the HD850 from corsair.  ITs not much more money than the 750, and it gives you an extra 100 watts of overhead.

Amazon has them for $134 shipped:
http://amzn.to/lHdtiw

[mouser98]

i only got all of the programming and other issues finally resolved this morning and have had it mining for about 2 hours now.  but it seems to be running okay, so far.  any idea what kinds of symptoms i might see if the PSU is overloaded?

[Lightspeed]

ive got a sweet 2600k rig right next to me, only 2 5830s, but the powerdraw is currently only 243 watts with both cards hashing /w 875core clock + cpu currently doing nothing

[CubedRoot]

Usually it will be simple lockups on the GPU's if you are running on the verge of overloading your PSU. Sometimes the system will randomly reboot.  Are you overclocking these GPU's?  They will require a good bit more power once you start overclocking them, thats when I started seeing all the problems on my rig.  Overclocking with that 5870 just put me right on the edge of stability. My GPU's would lock up and I would be forced to reboot my system and downclock the GPUs.

[sang]

Im running an entire mining rig w/ 2x 5830's at 1000mhz on a 400w Enermax PSU :-)

Its all about the 12v rails.

[mouser98]

Usually it will be simple lockups on the GPU's if you are running on the verge of overloading your PSU. Sometimes the system will randomly reboot.  Are you overclocking these GPU's?  They will require a good bit more power once you start overclocking them, thats when I started seeing all the problems on my rig.  Overclocking with that 5870 just put me right on the edge of stability. My GPU's would lock up and I would be forced to reboot my system and downclock the GPUs.

i only have them oc'd to 875, with mem uc'd to 900.  as far as i know, that's all aticonfig will let me do, and i am happy with it, i don't want to push them too hard, the third card temp is 67C as it is (although the others are much lower)

[Fakeman]

What is the advantage of underclocking the ram? I have one Sapphire 5830.

[mouser98]

What is the advantage of underclocking the ram? I have one Sapphire 5830.

it doesn't use as much voltage, so it doesn't generate as much heat, or spend the elec$

[Fakeman]

Tried that and it doesn't seem to decrease hash rate, if it saves a bit of power then I'll keep doing it.