Can I Crossfire 2 r9 290X

PersianBoySina · Mar 15, 2014

My mother board is a MSI Z87-G43 and im not sure if i can. I have checked and it says it has gen 3 pci-e but im not sure if both are gen 3? What psu should i get with what wattage?

Specs

i7 4770k @ 4.0ghz
8GB ddr3 ram @ 2100mhz
Currently (gigabyte hd 7970) @ 1065mhz core and 1650mhz memory
Corsair 750w psu (fully modular)
2 WD hdds 5400rpm
sandisk 60gb ssd

AshyCFC · Mar 15, 2014

You can crossfire two 290x's no trouble on your board.

I'd get a 850W PSU or higher to run Crossfire of those two cards.

PersianBoySina · Mar 15, 2014

Thanks alot for the ULTRA quick reply.

PersianBoySina · Mar 15, 2014

If i were to keep my 750w psu and use it only for my gpus and buy another for rest of the system how many watts would i need?

AshyCFC · Mar 15, 2014

I don't get why you'd run two separate PSU's just run one powerful one.

PersianBoySina · Mar 15, 2014

AshyCFC :

i don't think id be able to sell my psu for that much

AshyCFC · Mar 15, 2014

It'll be hard to get two PSU's into a standard case

I'd also look at crossfire 780s if 290x's are too costly.

then you can spend money on a good PSU.

PersianBoySina · Mar 15, 2014

AshyCFC :

I was thinking about the very same thing but only problem is my MoBo says it only supports crossfire. no sli logo on the board.

AshyCFC · Mar 15, 2014

Ah yes...no SLI on that mobo.

The 290 point still stands.

My bad miswording crossfire and SLI.

PersianBoySina · Mar 15, 2014

AshyCFC :

Its ok but should i go with 1000watts or 850watts, and links please

AshyCFC · Mar 15, 2014

Links for what sorry?

At full load I know that 290X each can draw 300W so 600W just for GPU's

+ 200W or so for the rest of your PC.

1000W is ultra safe though.

Where are you from, I'll suggest some.

eazy899 · Mar 15, 2014

Go for this.

http://www.techpowerup.com/reviews/EVGA/SuperNOVA_G2_1000/

Its an excellent psu and great value for money.

Fully modular, 1000 watts, easily gold efficiency and actually just misses out on platinum efficiency by a small margin, about 30 pounds cheaper than the next nearest comparative psu.

I have it myself and its excellent, I am going to use it to crossfire 2 Asus Dircet CU 2 R9 290xs.

eazy899 · Mar 15, 2014

BTW if its a 1000 w PSU like the one I listed is and gold efficiency to 90% like the one I listed is, it only gives 900 watts of power.

So 2 Asus Direct CU 2 R9 290xs are about 315 watts each so that's 630, the rest of my set up including case fans draw about 200 watts, put that together and that's 830 watts which gives me 70 watts left over for if I wish to increase my ram from 16 gb to 32 gb and add another HDD incase I need more than 1 tb of space.

Basically, what I'm trying to say is even with a great psu like the 1 I listed, there is very little spare wattage left over, just about enough to add 2 more case fans if I want to go from 4 to 6, add another HDD or SSD and add 2 more ram sticks.

If I added all of those, I would have between 30 and 35 watts left unused which is very tight and its always good to have a little head room so I would always want that much unused anyway rather than having a pc freeze or crash.

You are in a similar boat as me so I suggest you do as I have done.

Having said that, I have an i7 4771, if you plan to overclock your i7 4770k, you might even use up that 30 watt headroom and not have enough power.

Tbh, I think there isn't enough power even in this 1000w to overclock with the components that I listed above, hence 1 reason for me getting the i7 4771.

PersianBoySina · Mar 15, 2014

Thanks alot to both of you and finally LAST question how much do you think id be able to get for a 5 month old Corsair 750w Builder Series boxed with all cables?

AshyCFC · Mar 15, 2014

depends on where you're from ^^

PersianBoySina · Mar 15, 2014

AshyCFC :

UK, still im stuck. I think if i get another 750watt psu primarily for the gpus and my current 750watt psu for the rest of the system. ofcourse it won't fit in my case but it'd be much cheaper and give me extra piece of mind. BTW would 750watt even be enough for 2 r9 290x only ( without mobo, cpu, ram ,hdd/ssd) and would i be able to overclock?

AshyCFC · Mar 15, 2014

It would be but it's seriously not practical.

You could probably get £40 or so for the 750 maybe more like £50.

Why don't you just take one 780ti as 1stronger card> 2 weaker cards.

I've also discovered a fatal flaw in this mobo.

It's trash for even crossfire. The second PCI-E slot is at x4 speed so the card will not perform anywhere near it would if it was at x8 or x16.

Single 780ti best option here.

Can I Crossfire 2 r9 290X

Reputable

Honorable

Reputable

Reputable

Honorable

Reputable

Honorable

Reputable

Honorable

Reputable

Honorable

Honorable

Honorable

Reputable

Honorable

Reputable

Honorable

Share this page