295x2 psu ?

Dicehunter

Resident Newb
Just watched the guvs 295X2 video and read the review, Now on the review it says 700w as drawn from the wall for the test rig, I'm gonna sound like a total nublet for asking this, But would an 850w PSU be safe enough for this card with my rig in the sig ?
 
It should be, yes but it will mostly depend on the PSU. I've seen another site saying that 1000W is the minimum to run one of these ALTHOUGH
Sapphire describes the power supply requirements a bit better
"System power supply with two 8-pin PCIe® power connectors that are each capable of supplying 28 A of dedicated current"
 
Reason why its 750 is because you need at least 28A for each cable.. 750 generally has the requirement. It's no so much as the wattage, more of the strength of the psu. Any quality unit will do from 750 and up:)
 
Corsair

HX850 = 1 x 70A 12V Rail
AX860/AX860i = 1 x 71.6A 12V Rail
CX850 = 1 x 70A Rail

XFX 850W XXX = 1 x 70A Rail

Silverstone SST-ST85F-GS Strider 850W = 1 x 70A Rail
Silverstone SST-ST85F-P Strider Plus 850W = 1 x 67A Rail

Seasonic M1211-850 EVO Edition 850W = 1 x 70A Rail
Seasonic X-850 850W = 1 x 70A Rail

EVGA 850W SuperNOVA 850 B2 = 1 x 70A Rail

Think you kind of see where this is going... Most of the 850 / 860W PSU will be single rail, and components can pull up to around 70 amps, but.... placing that load on a single rail over time will not be too healthy for the PSU.

Plus Tom might said it pull 700W, but if you will be overclocking, the (approx) 84 Watts the CPU is pulling (that on Turbo alone with no overclock) is going to be cutting it fine on what the PSU is being loaded up to, so a 1000W PSU would ultimately be better for it.

Yes it would work, but in long term you would be better off getting the 1KW PSU for your machine.
 
Think you kind of see where this is going... Most of the 850 / 860W PSU will be single rail, and components can pull up to around 70 amps, but.... placing that load on a single rail over time will not be too healthy for the PSU.

Yes it would work, but in long term you would be better off getting the 1KW PSU for your machine.

Would this be the case for a single GPU?... not dual GPUs in one card, but a single one like the 970?...
And dumb question... but why isn't it good in the long term?...
 
This has come up in the past and Tom recommends at least a 1000 watt psu and no daisy chain leads as they don't seem to like them
 
Would this be the case for a single GPU?... not dual GPUs in one card, but a single one like the 970?...
And dumb question... but why isn't it good in the long term?...

It all still applies even to single GPU cards, but no where near as bad, as the power drain will lead to higher temps inside PSU (and now for the sciencey bit), and the higher draw of power will strip the electrons from the copper (and other elements and substances used) at a quicker rate, even more so with the higher temps which in turn leads to what is commonly known as component degradation, and that is without the damage that will eventually come with running the PSU near its rated limit continuously (can lead to the capacitors to burst due to heat expansion inside them which is where the lids pop), diodes to break (passes current both ways instead of one way, and they are used in converting AC / mains electric (a bridge rectifier) to DC), resistors to turn into light bulbs, and with an accumulation of dust inside PSU, with any of the above, can lead to even higher temps, and increases the risk fires.

Yes I realise that what I have stated above, is just the basics and the fire thing isn't a high probability with todays better quality components (but the risk is still there), but it should hopefully give you a basic insight into why the long term isn't a healthy option.

The single cards still have the above but at a lesser rate as they are drawing much less power, therefore generating less heat and pulling less current so they are doing so at a much slower rate, and surface mounted components (the little things on circuits) are much more prone to heat as they haven't the volume or surface area to dissipate the heat as effectively.

Hope this kinda of helps explain things a little.
 
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It all still applies even to single GPU cards, but no where near as bad, as the power drain will lead to higher temps inside PSU (and now for the sciencey bit), and the higher draw of power will strip the electrons from the copper (and other elements and substances used) at a quicker rate, even more so with the higher temps which in turn leads to what is commonly known as component degradation, and that is without the damage that will eventually come with running the PSU near its rated limit continuously (can lead to the capacitors to burst due to heat expansion inside them which is where the lids pop), diodes to break (passes current both ways instead of one way, and they are used in converting AC / mains electric (a bridge rectifier) to DC), resistors to turn into light bulbs (with an accumulation of dust inside PSU, with any of the above, can lead to fires).

Yes I realise that what I have stated above, is just the basics and the fire thing isn't a high probability with todays better quality components (but the risk is still there), but it should hopefully give you a basic insight into why the long term isn't a healthy option.

The single cards still have the above but at a lesser rate as they are drawing much less power, therefore generating less heat and pulling less current so they are doing so at a much slower rate, and surface mounted components (the little things on circuits) are much more prone to heat as they haven't the volume or surface area to dissipate the heat as effectively.

Hope this kinda of helps explain things a little.

Damn... so as I completely suck when it comes to PSUs, will this do for my PSU which is the 650W version of the short Silverstone one, with 2600K, 970 Strix and no overclocking what so ever?...
When you say continuesly... does that mean running it 24/7?, is that a bad thing as well... I mean, keeping the PC on for 24/7?...

Although, I've noticed that keeping my PC on 24/7 and not shutting it down from time to time, it gets slower and the RAM gets more usage without me opened any new programs or so lol. Off topic here lol, sorry about that...
 
Damn... so as I completely suck when it comes to PSUs, will this do for my PSU which is the 650W version of the short Silverstone one, with 2600K, 970 Strix and no overclocking what so ever?...
When you say continuesly... does that mean running it 24/7?, is that a bad thing as well... I mean, keeping the PC on for 24/7?...

Although, I've noticed that keeping my PC on 24/7 and not shutting it down from time to time, it gets slower and the RAM gets more usage without me opened any new programs or so lol. Off topic here lol, sorry about that...

lol, the PSU off and on causes different problems, eg power spikes on initial startup (yes capacitors etc soak up the majority of the spike but some of it will still persist), but if it is on 24/7 yes it is continuously stripping the electrons, but stays well within the tollerances to which the PSU's are built to withstand, and as for your 650W PSU, that is easily ok for the 970 and your CPU unless you are running a ridiculous amount of hard drives, fans, pumps (if watercooling) and numerous other bits and pieces, so nothing for you to really worry about.
 
Okay cool cool... no, all I'm running is an H100i, 2 rad Noctuas fans, 1 120 back, 1 200 front, 2 SSDs and 2 HDDs :)
All on air btw, since doing watercooling the 380T is basically useless lol ^_^

Thanks though for "clarifying" that up for me! :)

Please don't hijack other people's threads, cheers.
 
Well I emailed Silverstone as the system it will be going in has an 850W Gold PSU with a 12V rail capable of 80 Amps, Silverstone said it will be fine and nothing to worry about :)
 
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