Can my PSU handle GTX 770 lightning ?

bagofweed · May 5, 2015

i'm going to buy an GTX 770 lightning but im afraid my psu can't handle it. i have an halfmman red storm 750W, GTX 770 recommend PSU is 600W but i've been reading past days that halfmman makes weak PSU and they're not reliable (HALFMMAN in general) couldn't see any reviews regarding my RED STORM model though, most people were talking about the halfmman 700 W that cost 30 euros when mine costs more then 50.

please tell me if its safe to run GTX 770 lightning with this PSU. my best regards.

my specs:
mobo: P55-US3L
i5 760 8MB cache @ 3.2 Ghz (i can run it safely OC at 3.6 ghz with this PSU)
HALFMMAN RED STORM 750 W
2x 2 GB DDR3 @ 1600 1 4 GB DDR3 @ 1600
2 fans NOCTUA CPU cooler
Asus gtx 750 ti 2GB PSU required 400W

marlonc98 · May 5, 2015

Theoretically your psu can run the gpu perfectly fine. Performance and quality wise, I cannot comment on such. Do you have a current gpu? Edit: Nvm I see. I'm pretty sure you will be able to supply the 770. But it can be unsafe due to common failures of this brand. I'd say just upgrade your psu, better be safe than sorry.

bagofweed · May 5, 2015

thank you for replying so quickly, im a bit afraid because some people were saying that halfmman PSU are clock bombs, because of the low quality components and voltage frequency etc, could my PSU fry the gpu or the psu itself while running GTX 770 or even with the afterburner OC's?

ko888 · May 5, 2015

Does your HALFMMAN RED STORM 750W ADK-A750 have two 150-Watt 8-pin PCI Express supplementary power connectors? According to Halfmman's webpage for that PSU it states that it only has two 75-Watt 6-pin PCI Express supplementary power connectors.

The MSI GTX 770 Lightning 2 GB [N770 Lightning] requires two 8-pin PCI-Express power connectors.

marlonc98 · May 5, 2015

It could fry the gpu sadly. Luckily, you could just get constant crashes and such but electricity doesn't always occur in our favor. Low reputation psu's tend to be unsafe and as a person commented in another forum, Halfmann tend to be very low quality and could not even bring out the 500w advertised, but a mere 360w.

marlonc98 · May 5, 2015

One more question, why not opt for a 970 since its way more power efficient and its roughly 20% faster in some benchmarks found. The 770 seems 100-150 bucks more except the EVGA 770.

bagofweed · May 5, 2015

it only have 2 pci-e 6 pins, but i saw that gtx 770 came with 2x 6 pins to 8 pin adapter

bagofweed · May 5, 2015

im going to buy in resale 200 euros GTX 770 lightning, i dont like the 3.5 vram idea from the GTX 970, i think its better to wait for directx 12 and sli my gtx 770 and get 4 GB vram

marlonc98 · May 5, 2015

I would just go for the 970. Way more efficient and get an adapter if you wanna risk it. Edit: Nvm you're right. Sounds good.

bagofweed · May 5, 2015

but could my PSU be that bad? just because it isn't from a well know label, it costs 55 euros. recently the PSU switch bottom is broken, can only stay on :/ and if i touch the AC cable i hear some sparkling sound and the pc turns off, but if i dont touch the cable its fine, working flawless

ko888 · May 5, 2015

bagofweed :

But the Halfmman Red Storm 750W doesn't have four 75-Watt 6-pin PCI Express supplementary power connectors that you will need to use those adapters.

bagofweed · May 5, 2015

you think its better then to sli instead of buying the gtx 970 in the future? i was thinking to buy the PSU when i was ready to sli GTX 770 but i guess its better to prepare myself now with a good PSU capable of sli in the future then cry for fried my new gpu. any ideas for good PSU with enough W for the sli?

bagofweed · May 5, 2015

i have 1 pci-e 6 pins on my gtx 750 and 1 6 pins spare

ko888 · May 5, 2015

The MSI GTX 770 Lightning 2 GB [N770 Lightning] requires two 8-pin PCI-Express power connectors. That's a theoretical maximum power allowance of 375 Watts.

You can't avoid that basic fact that the card itself can draw 270 Watts during stress testing.

The reason that the Halfmman Red Storm 750W only came with two 75-Watt 6-pin PCI Express supplementary power connectors is because the PSU manufacturer knows that the PSU is not capable of supplying any more power than that to the PCI Express supplementary power connectors.

You can try using those adapters at your own risk. But that is up to you whether or not you want to accept the possibility of burning out the graphics card and the power supply and possibly other components attached to that PSU.

bagofweed · May 5, 2015

i will probably buy a new PSU, but i want one of good quality and able of sli the 770 in near future, any ideas? i dont understand why do i need 4 pci e 6 pins, im using 1 to power the motherboard and the one for my gpu and i have 1 more that's not being used

ko888 · May 5, 2015

bagofweed :

What do you mean you're using one to power your motherboard? That's a (4+4) CPU power connector and has nothing to do with graphics cards.

Before I looked up an actual review of the MSI GTX 770 Lightning 2 GB [N770 Lightning], to determine the actual adapter cables you were talking about, I assumed you were talking about the dual 6-pin PCI-E to 8-pin PCI-E adapter cables.

The risk of using the included adapter cables, that came with the MSI GTX 770 Lightning 2 GB [N770 Lightning], with your Halfmman Red Storm 750W is that you're doubling the power drawn through each of those PCI-E cables on the PSU.

If the wire gauge of the Halfmman Red Storm 750W's cabling is too thin you will risk melting the insulating jacket on the wires causing a short circuit and possibly an electrical fire.

If the PSU has any sort of OCP (Over Current Protection) on the rails, to which the two 6-pin PCI-E cables are connected to, it may/will limit the maximum amount of power that that can be drawn from those +12V rails. That means that the graphics card will not receive enough power to function properly.

System Power Supply Requirements for two MSI GTX 770 Lightning graphics cards in 2-way SLI mode
• a minimum of an 850 Watt or greater system power supply is recommended. (Minimum system power requirement based on a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor.)
• the system power supply must also have a maximum combined +12 Volt continuous current rating of 59 Amps or greater
• the system power supply should also have at least four 150-Watt 8-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

Here's an example of a top tier PSU:

EVGA SuperNOVA 850 G2 (220-G2-0850-XR)
• OEM: Super Flower (Leadex Gold Platform)
• maximum combined +12 Volt continuous current rating: 70.8 Amps <===== More than Sufficient
• six 150-Watt (6+2)-pin PCI Express supplementary power connectors <===== More than Sufficient
• Full Modular Output Cables: Yes
• Official Intel Haswell Compliance: Yes
• 80 PLUS GOLD Efficiency Certification
• 10 Year Limited Warranty
• Link: http://www.evga.com/Products/Product.aspx?pn=220-G2-0850-XR

marlonc98 · May 5, 2015

Yeah hes completely correct about thebpsu. But fyi, running sli doesnt add vram and i believe the lightining runs with 2gb. So sli wont upgrade your vram at all. If you are really worried about vram, get a 970 maybe a 980 if you really can. But with the price of a 980 you can even extend to a r9 295x2 which is pretty powerful

Can my PSU handle GTX 770 lightning ?

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