Thinking of going SLI 780 Ghz edition, is my 750W RM750 Gold enough?

Munimentum

Munimentum

Munimentum

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Hi, so as the title states, I'm thinking of getting a second Gigabyte 780 Ghz edition but I'm wondering if the Corsair RM750W Gold would be enough to power it.

I'm running a 4770k @ 4.6Ghz with a corsair H100 (4 fans in push/pull as well as 4 other case fans), a 500GB Samsung Evo, 1x4TB HDD and a 2TB HDD aswell as an Asus DGX and 16GB of 2133 ram. as well as various USB related items (mouse, keyboard, usb connector in keyboard , 360 controller for windows).

Given all of that, do you think it would be enough or would it be stretching the limits somewhat?

Thanks!
 
Holly crap I thought he'd have enough for the cards but not a big OC on top but yeah running so close to full load would not be my first choice. if the psu pops it could take everything with it.
 
As RJC said, you should be able to squeeze it in nicely, I expect it would use around 700W max
 
scotsdragon said:
no min id be using is a great 1000w id recommend getting one of the 1300w psu's just so your not running near capacity all the time
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So much nonsense.

A 550 W power supply is enough for any system with a single 780. With two 800 W is plenty. If you're planning to do some big overclocks then up this a bit, but that already includes a decent safety factor.

http://www.guru3d.com/articles_pages/geforce_gtx_780_sli_review,4.html

I'd keep the current PSU and run them at stock personally.
 
That's quite a relief, I don't really intend to overclock them to be honest. It was initially my intention with this single card but if I go for two I probably won't bother.

So even with all the HDDs and soundcard in my system you guys think 750w will be enough for two GHZ edition 780s? Actually I guess that means they are technically overclocked aren't they. Will that make a difference? Should I just get a regular edition Gigabyte 780 or is it worth my while getting the identical clocked card?
 
750 would probably be ok but don't underestimate the value of running the PSU with a decent overhead - for a single 780 then I'd reccomend 550watt minimum from a high quality PSU and 600watt from anything else and approx 300 watt on top of that for SLI (can get away with less for SLI if your not overclocking the GPUs).

My setup 4820K @ 4.4GHz, 780GHZ @ 1267MHz peaks at around 400watt draw at the wall in BF4 and somewhere around 370watt average over a long session of BF4 and in most other stuff is lower.
 
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I seen about 390w running bf4, single wf 780 and an i7 4770k @4.5ghz. Not tried it with the 4790k which supposedly uses a bit more power. Id only envisage the need for a 1000w psu if you were heavily overvolting the cards on a custom bios.
 
Rroff said:
750 would probably be ok but don't underestimate the value of running the PSU with a decent overhead - for a single 780 then I'd reccomend 550watt minimum from a high quality PSU and 600watt from anything else and approx 300 watt on top of that for SLI (can get away with less for SLI if your not overclocking the GPUs).

My setup 4820K @ 4.4GHz, 780GHZ @ 1267MHz peaks at around 400watt draw at the wall in BF4 and somewhere around 370watt average over a long session of BF4 and in most other stuff is lower.
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I would normally run with 850W plus, however I don't fancy spending £100-£150 on a new PSU if this one would suffice, hence the question as I don't want to risk anything/drop the cash if it may not be possible. Thankfully you guys seem to think I would be ok which I'm happy about.

Another question I have which I mentioned in my last post - is it worth buying a second Ghz edition card to match them completely or would a stock 780 be fine? I'm not sure what sort of effect that would have as I haven ran Nvidia cards for years. Also, are there any problems with mix and matching card manufacturers? e.g running my windforce with an EVGA or MSI?
 
That's a good question. AFAIK SLI runs in one of two modes: splitting each frame into parts for each GPU, and rendering each frame alternately on each GPU. In the first case it shouldn't matter if the GPUs are different as the engine should do the load balancing. In the second case the stronger GPU might be waiting for the weaker one all the time. I don't know if anyone's ever tested if this is the case though.

A pair would be nice but like most things probably not worth spending too much extra on.
 
joeyjojo said:
That's a good question. AFAIK SLI runs in one of two modes: splitting each frame into parts for each GPU, and rendering each frame alternately on each GPU. In the first case it shouldn't matter if the GPUs are different as the engine should do the load balancing. In the second case the stronger GPU might be waiting for the weaker one all the time. I don't know if anyone's ever tested if this is the case though.

A pair would be nice but like most things probably not worth spending too much extra on.
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Hmm, I see. I'll probably stick with getting another Ghz edition then, I was just thinking it might've saved a bit of power consumption and a bit of cash but never mind.
 
You can indeed mix cards from different vendors. Providing of course they both have the same vram count. Ie best not to mix a 3gb card and a 6gb card together. Windforce cards in sli can be hot running if board spacing is tight and case airflow isnt good. Ive ran wf 460's and gtx 670's. The former got too hot due to board spacing, 96c on the top card. The 670's were fine though in the board in sig. 70 and 55c. The top card in any sli setup will always run a bit warmer than the bottom one. This is made a bit worse due to the wf having a non reference cooler that dumps heat into the case. The warm air from the top card just gets circulated between both. Unlike reference blower cards that exhaust out the pcie slot.
 
spec in my sig pulls 500-550w from the wall when gaming, you should be alright with a decent PSU given you have the RM you should be alright.

As for mixing and matching, you can it's perfectly viable, you can run the cards at different speeds however typically it's best to mix the same cards you know they are rated the same out the box. On top of that if you care there is the aesthetics.

I'd go for 2 of the same if I could, and only mix IF I have to.

Example:
Both my cards come @ 915/6008 stock, BOTH overclock to 1202/7008 happily.
 
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