Best GPUs for minning

[loader140]

For your current hash rates with the 270's, how much power are you drawing? This is a huge concern for me right now.

I don't know off the top of my head as I don't have a power metter, but the 270s draw about 225W each, then the mobo, CPU, HDD, RAM etc etc adds up to be about 100W (below 1500W for 4)

OC=Overclock
PSU=Power Supply Unit

[InCoinsITrust]

280X is the best solution, if you can get 280X tri-x for normal price, it is even better. Used HD 7950 may be even better deal, if the price is low.

[Lauda]

For your current hash rates with the 270's, how much power are you drawing? This is a huge concern for me right now.

I don't know off the top of my head as I don't have a power metter, but the 270s draw about 225W each, then the mobo, CPU, HDD, RAM etc etc adds up to be about 100W (below 1500W for 4)

OC=Overclock
PSU=Power Supply Unit

Wrong. They draw in around 150W (the 270x), and you can handle 4 at 850W.
No the 280x are not better than the 270x or 270. This is just plain wrong.

[Digi7ech]

It's a trade off between PCI-E slots and total Hash power.

I'll take your word that 270x's run 450khs.
Assume 4 PCI-e Slots on the Mobo
So 4x 450khs = 1.8MHs

7950's run 550-625khs normally.
4x 550-610khs = 2.2-2.4MHs (I personally run at 2.2mhs)

My Club Queen 280x runs at 710khs(1030/1500mhz)
4x 710khs = 2.8MHs

So you need to decide. Do you want MAX KHS per motherboard/PSU setup? or cheapest?

I might build a 270x 4 card rig to supplement my current power. It's just getting hard to find 7950's or 280x's that aren't going for serious cash.

[loader140]

Wrong. They draw in around 150W (the 270x), and you can handle 4 at 850W.
No the 280x are not better than the 270x or 270. This is just plain wrong.

I didn't know for sure, I did know it was 150 for the other brands cards (MSI sapphire etc) but the gigabyte can have MORE than that if it needs it because it has 2 6 pins, 6 pins are both 75 W and the MB PCI is 75 W so the gigabyte ones can take that if needed. And when working anything out for power I work out the WORST CASE scenario (like GPU/CPU running flat out taking in their MAX).

No the 280x are not better than the 270x or 270. This is just plain wrong.

If you reread what I said from the beginging, I have been promoting the 270, over the 270X and every other R9 series card, I haven't once said that 280s are better (only if you want it in a more compact rig, but then you would get 290X, but for the value it isn't worth it)

[Lauda]

The 270 and 270x are almost identical.
The 270x can give you up to 500 kh/s if you know what you're doing.