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Author Topic: Going to build 4x5830 rig, need help  (Read 1702 times)
fabrizziop
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January 06, 2012, 01:48:39 AM
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Hi.

I'll be building a 4x5830 rig. But, it's my first time in a quad-gpu rig, so I need to be answered some questions:

I can't find a nice 850W psu for less than 100$, so I'll be getting a Thermaltake Toughpower 650W for 40$ and a Seasonic 650HT for 60$. Is it a good idea to place 2 GPUs on one PSU and the other two and the Mobo on another?.

I need to buy 3 risers 1x-16x(already got 16x-16x), but, do I need the molex powered ones?.

Anyone tried this mobo? MSI 785-G53?. I bought it, and it seems it's nice for bitcoin mining(got it refurb at 60$).

Thanks in advance to all of you!
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Danijel Habek
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January 06, 2012, 06:58:40 AM
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If you can't afford PSU, you'll have to stick to multi-PSU setup, but be aware if they're not really efficient you may have them fried after some time. So it's not such a good idea, but it will hold for some time, and YMMV.

I remember I've read on this forum that powered molex are to be used if you're using to drive more than 4 GPU's on a motherboard. I have 4x5850 GPU's attached to a motherboard with non powered molex risers, and doing fine with such setup.

I can't give you opinion on your motherboard, just try it, it should be the least part to worry about in your current setup.

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fabrizziop
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January 06, 2012, 09:16:30 PM
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Need a second opinion, in the risers part Smiley
DeathAndTaxes
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January 06, 2012, 10:20:48 PM
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Personally I don't like multi PSU setups.  You want an efficient rig and that means 80Plus-Gold.  If you had to I would start w/ 3 GPU and then look to expand w/ first months revenue.   You can always add more GPU but you are unlikely to every replace PSU unless it dies. 


On the risers I don't know.  I don't use em (3x5970 in a MB w/ x16 slots spaced two apart).
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January 06, 2012, 10:41:07 PM
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Personally I don't like multi PSU setups.  You want an efficient rig and that means 80Plus-Gold.  If you had to I would start w/ 3 GPU and then look to expand w/ first months revenue.   You can always add more GPU but you are unlikely to every replace PSU unless it dies.  


On the risers I don't know.  I don't use em (3x5970 in a MB w/ x16 slots spaced two apart).

These things make multi-PSU painless:



If you keep the loads under 50-60% of the PSU rating, and get ones that are Gold certified, it works great.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
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January 06, 2012, 10:47:15 PM
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IF you get two Gold rated PSU it is unlikely you are saving that much.  Two PSU is simply an extra component, more space, more potential failures.

Not saying it is impossible but to make your rig more complicated to save $40 and (as OP indicated) do so at reduced efficiency just doesn't make any sense to me.

Then again I got 5 rigs to manage so I like them .... simple. 
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January 06, 2012, 10:49:44 PM
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IF you get two Gold rated PSU it is unlikely you are saving that much.  Two PSU is simply an extra component, more space, more potential failures.

Not saying it is impossible but to make your rig more complicated to save $40 and (as OP indicated) do so at reduced efficiency just doesn't make any sense to me.

Then again I got 5 rigs to manage so I like them .... simple. 
Of course - but if you are aiming for 50% load, as well as running 6 5870's in a rig, you have to either get 2 PSUs or pay a stratospheric cost for a single 2000 watt PSU  Wink

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
fabrizziop
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January 06, 2012, 11:51:31 PM
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I don't really care about efficiency, as a kWh here is about 0.02$.

I'm going for the seasonic 650HT, and an Antec Basiq Plus 550W.
Brian DeLoach
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January 07, 2012, 12:44:14 AM
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I don't really care about efficiency, as a kWh here is about 0.02$.

What do you live?

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fabrizziop
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January 07, 2012, 01:05:22 AM
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Venezuela. Gotta love this country for gasoline(0.08$/gallon) and electricity.
DeathAndTaxes
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Gerald Davis


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January 07, 2012, 01:14:56 AM
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Venezuela. Gotta love this country for gasoline(0.08$/gallon) and electricity.

Paid for via confiscation of wealth. Smiley
fabrizziop
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January 07, 2012, 01:59:14 AM
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I said nothing more. Paid with subsidies(thanks to 100$ oil barrel), the confiscation of wealth pays the boats of the mayors and all of the corrupted people.

The govt calculated the 2011 budget with the oil barrel at 40$. So, the excedent is unjustified income, and they can spend it as they want(gifting countries hospitals, although our public health system is underfunded).

I don't want to get into politics now, corrupted pieces of shit make me mad.
mu50stang
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January 08, 2012, 05:31:07 AM
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Im not sure if 104.99 is to much for a psu for you, but I have 2 5870's and 2 5830's running on a corsair 750w for months now with no issues.  I have all my card overclocked and they are running pretty good.
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