Does my PSU cover the power demand of my GPU upgrade?

Granulli

Reputable
Aug 5, 2014
4
0
4,510
Hello,

I am thinking about upgrading to a GTX 770 but keep wondering whether my PSU would support it sufficiently or if I'd even be able to hook it up.
Currently my system is powered by: http://www.thermaltake.com/products-model.aspx?id=C_00001776

From what I understand, which is very lttle, the PSU should theoretically be able to do the job, but I may very well be mistaken.
Even if it does, I only have 2 6-pin connections, where the GTX 770 would require at least one 8-pin. Yet I'm told that using a 6- to 8-pin adapter may actually endanger the cards itself.

Bottom line, do I need a new PSU? I'm not too keen on spending a hundret extra but I dont want to endanger my new hardware either.

Any advice? Thanks...

 
Solution
I find it funny that companies bother to include 6-to-8 pins adapters: if they are going to openly supply a way to bypass the 8pin sense on their 8pin/150W connector, they might as well just spare themselves the expense of the sense circuitry and adapter by allowing 150W over 6pins. 8pin cables only provide two extra ground wires with the same three 12V ones anyway.

Wiring-wise, 12A across three pins is only 4A/pin and on the minimum recommended gauge #18 (20 milliohms/m), that is only 40mV (0.33%) voltage drop across the cable and 160mW wiring power loss per wire, which is perfectly fine.

Makes me wonder why they ever bothered with the 8pin spec. I'm sure they thought it was a good idea at the time.

Granulli

Reputable
Aug 5, 2014
4
0
4,510
Oh my god, I must be blind...or just a bit mushy in the brain from reading about hardware for the last few days. How could I have missed this!

Thanks both of you very much for the answers and freeing me of my worries.
 

InvalidError

Titan
Moderator
I find it funny that companies bother to include 6-to-8 pins adapters: if they are going to openly supply a way to bypass the 8pin sense on their 8pin/150W connector, they might as well just spare themselves the expense of the sense circuitry and adapter by allowing 150W over 6pins. 8pin cables only provide two extra ground wires with the same three 12V ones anyway.

Wiring-wise, 12A across three pins is only 4A/pin and on the minimum recommended gauge #18 (20 milliohms/m), that is only 40mV (0.33%) voltage drop across the cable and 160mW wiring power loss per wire, which is perfectly fine.

Makes me wonder why they ever bothered with the 8pin spec. I'm sure they thought it was a good idea at the time.
 
Solution