What hash rate are you getting with the 270s? and which brand of 270s did you get?

Thanks for supplying that hopefully good news. Would you please update this post if at any stage you do manage to undervolt them. Also I cannot get over how expensive that PSU unit was. I really do hope it has good resale value...

Just to also say I bought a B Grade MSI Z77A-GD65 Intel Z77 motherboard for £70 and that included 8GB of Ram free with it. I take it, it being a completely different motherboard to what you have bought will not effect my attempt to match your hash rate.

Well you could run 5 cards on that power supply at least.

I take it there will be no way in the future to undervolt the MSI cards.

And alphacenturion, it seems its only the msi cards which are in stock in the whole of the uk. No luck finding any of the others anywhere else.

I have just purchased 4 of the MSI Radeon R9 280X Gaming Edition cards along with the Silverstone strider 1500 watt PSU from Overclockers. Having read about how much power they consume and having spent so much money on the power supply I am very disappointed in my decision to purchase them.

Now I have two options I am considering, I either send them back and buy the 6 of the Sapphire Radeon R9 280X toxic which Amph suggested to buy. The reason I would buy 6 cards instead of 4 is because I have spent the money on the 1500 watt PSU so I may as well make use of it. It should be powerful enough to run 6 of the Sapphire Radeon R9 280X Toxic cards shouldn't it?

My other option is to keep the cards and just live with the higher power costs.

One thing to keep in mind my for my decision is that I can purchase my electricity at 7p a unit, which is half the price of what most people would be paying.

So guys which option should I choose?