GTX 770 on a 430W PSU?

[bkrish546]

Hello,

I am wondering if my current evga 430w 80+ white efficiency power supply will be enough for a evga gtx 770 superclocked. My system power is quite low, so ok. not worried too much about watts, but concerned about amps. here are my system specs:

i3-6100
Gigabyte h110-s2h
1x O.D.D
1x 120gb sata 3 ssd
1x 7200rpm 500gb hdd
2x arctic 1500rpm ultra quiet f12 pro pwm fans
1x zalman 900rpm fan
1x intel stock fan
1x fan hub powering all fans except the zalman one. powers the intel stock one too. connected via sata power.

many thanks

 

[raisonjohn]

For your GPU, a GTX 770 has a specified graphics power of 230W (i.e., ~19A x 12VDC) and a recommended system power of 600W (i.e., PSU), according to Nvidia. Since your EVGA GTX 770 SC requires supplmentary 6-pin and 8-pin PCIE power connectors, then, theoretically, the GPU can pull to as much as 300W (~25A) power (i.e., 150W from the 8-pin + 75W from the 6-pin + 75W from the PCIe x16 slot of your motherboard), though will not necessarily use all of it. Tests made by Guru3d show that the EVGA GTX 770 SC, when fully stressed, can reach a peak/maximum 199W (~16.6A x 12VDC) power draw (for the GPU alone) and goes on to further recommend that "On your average system the card requires you to have a 550 Watt power supply unit".

For your CPU, an i3-6100 has a TDP of 51W, according to Intel. This roughly translates to 51W (i.e., 4.25A x 12VDC) of power draw. Tests made by HardwareCanucks show that the Intel i3-6100, when fully stressed, can reach an average 58W (~4.8A x 12VDC) power draw (for the entire PC system with no GPU).

RAM modules would draw very minimal power/amps. Assuming you have 2x8GB DDR4 modules, tests made by Tom's Hardware show that 16GB (two modules), would consume only ~6W (i.e., ~0.5A x 12VDC).

Rough estimates on fans, at a high ~0.30A estimated draw per fan using 12VDC would consume around ~14W when using 4 of these fans (i.e., ~0.3A x 12VDC x 4 fans).

So, theoretically, total system power at the +12V rail would be around ~200W (GPU) + ~60W (CPU) + ~6W (RAM) + ~14W (Fans) = ~280W (i.e., ~23.33A). Adding a 100W (8A) more headroom for other connected components that may use the +12V rail (HDD/SSD/LED/etc.), we can say, around 380W (or ~32A) total.

Note that most of the HDD/SSD will use more of the 3.3VDC (though SATA power also have 5VDC and 12VDC connections).

Your PSU, the EVGA 430 W1, 80+ WHITE 430W (100-W1-0430-KR), provides a +12V rail ampere rating of 34A (i.e., 408W over 12VDC). Given that your PC system will most likely require ~32A (i.e., ~380W) at the +12V rail with our above theoretical computations, your EVGA 430W would be pushing it to its limits to power your entire rig -- it might run it but is definitely not recommended.

My recommendation is to get a good-quality 550W power supply, such as the Seasonic G-550 (SSR-550RM) or the EVGA SuperNOVA G3 550W or EVGA SuperNOVA G2 550W series, depending on which are readily-available in your location and will fit your budget.

These PSU's would allow you to also upgrade your GPU in the future to a more powerful but lower-consumption (such as the GTX 1000 series or the RX 400 series).

 

[dontlistentome]

Short answer= no. That's mainly because the card requires two pci-ex connectors but that power supply has one. Right there that tells you everything you need to know.

 

[bkrish546]

For your GPU, a GTX 770 has a specified graphics power of 230W (i.e., ~19A x 12VDC) and a recommended system power of 600W (i.e., PSU), according to Nvidia. Since your EVGA GTX 770 SC requires supplmentary 6-pin and 8-pin PCIE power connectors, then, theoretically, the GPU can pull to as much as 300W (~25A) power (i.e., 150W from the 8-pin + 75W from the 6-pin + 75W from the PCIe x16 slot of your motherboard), though will not necessarily use all of it. Tests made by Guru3d show that the EVGA GTX 770 SC, when fully stressed, can reach a peak/maximum 199W (~16.6A x 12VDC) power draw (for the GPU alone) and goes on to further recommend that "On your average system the card requires you to have a 550 Watt power supply unit".

For your CPU, an i3-6100 has a TDP of 51W, according to Intel. This roughly translates to 51W (i.e., 4.25A x 12VDC) of power draw. Tests made by HardwareCanucks show that the Intel i3-6100, when fully stressed, can reach an average 58W (~4.8A x 12VDC) power draw (for the entire PC system with no GPU).

RAM modules would draw very minimal power/amps. Assuming you have 2x8GB DDR4 modules, tests made by Tom's Hardware show that 16GB (two modules), would consume only ~6W (i.e., ~0.5A x 12VDC).

Rough estimates on fans, at a high ~0.30A estimated draw per fan using 12VDC would consume around ~14W when using 4 of these fans (i.e., ~0.3A x 12VDC x 4 fans).

So, theoretically, total system power at the +12V rail would be around ~200W (GPU) + ~60W (CPU) + ~6W (RAM) + ~14W (Fans) = ~280W (i.e., ~23.33A). Adding a 100W (8A) more headroom for other connected components that may use the +12V rail (HDD/SSD/LED/etc.), we can say, around 380W (or ~32A) total.

Note that most of the HDD/SSD will use more of the 3.3VDC (though SATA power also have 5VDC and 12VDC connections).

Your PSU, the EVGA 430 W1, 80+ WHITE 430W (100-W1-0430-KR), provides a +12V rail ampere rating of 34A (i.e., 408W over 12VDC). Given that your PC system will most likely require ~32A (i.e., ~380W) at the +12V rail with our above theoretical computations, your EVGA 430W would be pushing it to its limits to power your entire rig -- it might run it but is definitely not recommended.

My recommendation is to get a good-quality 550W power supply, such as the Seasonic G-550 (SSR-550RM) or the EVGA SuperNOVA G3 550W or EVGA SuperNOVA G2 550W series, depending on which are readily-available in your location and will fit your budget.

These PSU's would allow you to also upgrade your GPU in the future to a more powerful but lower-consumption (such as the GTX 1000 series or the RX 400 series).

I see. I forgot to mention i have crucial 1x8gb ddr4-2133. Well i dont have any plans of upgrading power supply unless it is absolutely crucial ( see what i did there). My other option would be to get another card that draws less power, but is still in budget. I tend to prefer the old ones because they are easy to find on eBay. My current thoughts are the r9 380. I dont want a card that isnt as good as the gtx 1050 Ti. Please can i have some recommendations from the community? Thanks

 

[bkrish546]

Oh and in case I didnt make it clear i was planning to get a molex to pcie power. Sorry about that!

 

[raisonjohn]

Scrap the idea of molex to PCIe power. It's non-standard and would risk damaging your GPU (and other components).

If you really (I mean REALLY) do not want to spend for a good-quality PSU (for whatever reason). Getting a lower-powered GPU will be the best option (as you already have a low-powered CPU).

Now, your subsequent-selected R9 380 is ALSO a power-hungry GPU (just a tad bit lower than the former GTX 770 you were considering). Certainly, a 430W-not-so-efficient PSU will not be enough for this.

You might want to take a look at the RX 470 as your next possible GPU option more powerful than the GTX 1050 Ti. It draws less power than the R9 380 and the GTX 770. It also will not be bottlenecked by your i3-6100. Recommended PSU is 450W: http://www.realhardtechx.com/index_archivos/Page362.htm. Your current 430W PSU would just be enough.

 

[bkrish546]

Scrap the idea of molex to PCIe power. It's non-standard and would risk damaging your GPU (and other components).

If you really (I mean REALLY) do not want to spend for a good-quality PSU (for whatever reason). Getting a lower-powered GPU will be the best option (as you already have a low-powered CPU).

Now, your subsequent-selected R9 380 is ALSO a power-hungry GPU (just a tad bit lower than the former GTX 770 you were considering). Certainly, a 430W-not-so-efficient PSU will not be enough for this.

You might want to take a look at the RX 470 as your next possible GPU option more powerful than the GTX 1050 Ti. It draws less power than the R9 380 and the GTX 770. It also will not be bottlenecked by your i3-6100. Recommended PSU is 450W: http://www.realhardtechx.com/index_archivos/Page362.htm. Your current 430W PSU would just be enough.

Right. Well, I have bought a new supply but I've been a bit of a gambler. It is NOT from a well known brand, and it was relatively cheap off eBay, but it had a 12 month warranty. It was a modular artic 750w power supply with 85% efficiency. The best bit is that it was £33. This seems like a big gamble, but it was new and the seller accepted returns so I just shrugged it off. Besides, my system doesn't take too much and it definitely will not push a 750w power supply. Anyway, I continued with my original plan and got the gtx 770 for £69, so there won't be any issues now, will there?