About to buy HD7850, PSU question

[k3lt]

Hello.
My PSU is OCZ ModXStream 500W (dual 12V rail 18A each)
Homever i just realised that the HD7850's requires 22A on 12V rail but has only 1 power connector, how is the power going to be distributed, will the PSU is going to deliver the 36A or only 18A ?
I'm little confused in there, would be happy if someone can answer this.

Thanks in advance.

 

[megaflegmi]

Hi there

I have 7850 and it's running smoothly on this psu specs - same 2x18A 12v lines.

and on a side note according to wizz the maximum draw for 7850 is 101w click which is less than 9A so your psu is totally fine. Don't know where you got that information that it needs 22A ... hope I helped .

 

[Crap Daddy]

That 22A is required for the whole machine so you'll be safe to put your card on one rail (18A) and your CPU and mobo on the other. Here's a good read:

http://www.jonnyguru.com/forums/showthread.php?t=3990

 

[k3lt]

Thank you for the quick answers.

 

[k3lt]

Sorry for double posting homever 1 more question, i have found a pretty cheap Zotac GeForce GTX 560 Ti 2GB , pretty much the same price as the HD7850.
Do you think this PSU would be capable of running this GPU aswell?
I cannot find any reviews of the 2GB version... (homever i'm pretty sure it has considerably higher power consumption)
Anyway here is my rig:

AMD Phenom II X4 965 C3 (overclocking to 3.8-4.0Ghz in plans, with about 1.45V)
AsRock M3A780GXH
OCZ Platinum 2x2GB 1600MHz CL7 (about to switch them for 2x4GB with low voltages)
Samsung 500GB F1 HD502IJ

What ya think?
Should i pick the 560 Ti or HD7850? (in terms of performance/PSU capability)

Personally i would prefer NVIDIA GPU as i always owned them (heard lots of moaning 'bout ATI drivers), actually i never had an ATI card.
I need to choose one today, as i'm ordering it right away any suggestions would be welcome.

 

[megaflegmi]

Well RAM on the GPU doesn't increase power consumption as far as I know. Between those cards I would pick 7850(I already have ):

- needs only 10A max on 12V rail
- a bit faster than 560ti 5%-7% click - check all resolutions

BUT if the 560ti is 448 cores then it's worth it ... BUT then you have to change psu because those can do 300W ... and that's 25A on the 12V rail from the GPU alone power consumtion of 448 cores in normal gaming it's around 215W(17,9A) but still that's too close to the nominal 18A. If they don't say if it is 448 or not ... assume it is NOT 448 cores in that case pick the 7850 and don't worry about drivers ... at least I haven't had any issues with it yet playing LoL,BF3, HMM6, Max Payne 3 all work flawlessly and almost maxed out(i don't go crazy on the AA, no more than x4) ... Oh you didn't mention the display you're using ... the resolution. As far as I know the 2gb on the 560ti will help only in 1920x1080(1200) resolutions and up if you use less than that ... doesn't really matter. I hope I didn't make it harder to choose

 

[k3lt]

The reason i want 2GB VRAM is specifically for the Project C.A.R.S game which likes enormous amounts of VRAM, it's early stage of development and it already can use about 1.2GB.

This Zotac has 384 Cores AFAIK, this one - http://www.morele.net/karta-graficzna-zotac-geforce-cuda-gtx560ti-2gb-zt-50307-10m-437750/

 

[DarkOCean]

Well the 7850 is newer faster and consume half the power so you choose.

 

[pantherx12]

Sorry for double posting homever 1 more question, i have found a pretty cheap Zotac GeForce GTX 560 Ti 2GB , pretty much the same price as the HD7850.
Do you think this PSU would be capable of running this GPU aswell?
I cannot find any reviews of the 2GB version... (homever i'm pretty sure it has considerably higher power consumption)
Anyway here is my rig:

AMD Phenom II X4 965 C3 (overclocking to 3.8-4.0Ghz in plans, with about 1.45V)
AsRock M3A780GXH
OCZ Platinum 2x2GB 1600MHz CL7 (about to switch them for 2x4GB with low voltages)
Samsung 500GB F1 HD502IJ

What ya think?
Should i pick the 560 Ti or HD7850? (in terms of performance/PSU capability)

Personally i would prefer NVIDIA GPU as i always owned them (heard lots of moaning 'bout ATI drivers), actually i never had an ATI card.
I need to choose one today, as i'm ordering it right away any suggestions would be welcome.

Most 7850s can be overclocked to around 7950/580 levels very easily. Without changing any voltage you should be able to get 1100mhz, and if your lucky you can get 1200-1300mhz ( 1300mhz is over a 50% overclock)

So I'd go with that.

 

[k3lt]

Ok thanks again, decision is made - 7850 it is.