Gigabyte P55-UD5

Hi All,

I have the above mobo and I am due to get ram for it.

However I am confused. The manual states the DDR3 ram it supports is 1.5v, yet I can only find 1.65v.

I have been specifically eyeing up this set:

http://www.ebuyer.com/product/173124

But I am unsure if they will work with my board.

Any help would be much appreciated.

From Intel's processor FAQ at:
http://www.intel.com/support/proce [...] 029913.htm
(probably also want to read the install guide at: http://www.intel.com/support/proce [...] 030850.htm - especially regarding pins - there are a lot of 'bent pin' problems cropping up!)

What are the Intel® Core™ i7 processor and the Intel® Core™ i5 processor DDR3 memory voltage limitations?
Intel® recommends using memory that adheres to the Jedec memory specification for DDR3 memory which is 1.5 volts, plus or minus 5%. Anything over this voltage can either damage the processor or significantly reduce the processor life span.

What is the maximum frequency for DDR3 memory when used with Intel® Core™ i7-900 processor series?
These processors support DDR3 memory with a maximum frequency of 1066 MHz. If faster DDR3 memory is used (such as 1333 MHz or 1600 MHz), it will be down-clocked to operate at 1066 MHz.

What is the maximum frequency for DDR3 memory when used with Intel® Core™ i7-800 processor series and the Intel® Core™ i7-700 processor series?
These processors support DDR3 memory with a maximum frequency of 1333 MHz. If faster DDR3 memory is used (such as 1600 MHz or higher), it will be down-clocked to operate at 1066 MHz.

That said, there's plenty people running 1.65 memory at high speeds, for no reason! If you'll take a look here:
http://www.tomshardware.com/review [...] 325-5.html
you'll see that there is no appreciable difference between actual performance levels of overclocked RAM... And, I'm pretty sure, all the fast stuff is actually over-volted over-clocked JEDEC standard DDR3-1066 1.5V at heart... I'm trying to hunt down reliable specs, but it seems to have become unfashionable to provide actual documentation for RAM, as evidenced by this lovely Corsair doc:
http://www.corsair.com/_datasheets/TW3X4G1333C9.pdf

I'll be back with more info tonight or tomorrow, probably providing an update to this:
http://www.tomshardware.com/forum/263130-30-mobos

Be sure to check out the info/warning re Zalman PSUs before ordering!

Thats why specific memory kits say "For i7".

You are comparing apples to orangutangs here. That 1066 7-7-7(RAM 'A'), assuming it will run at 1600, will need to run at 1600 10-10-10, or 11-11-11; conversely, the 1600 7-7-7(RAM 'B') will run at 1066 5-5-5 (and maybe, at 5-4-5, or 5-4-4); either way, even if comparing RAM A at 1600 with RAM B at 1066 (and 5-5-5), RAM B will be a lot faster - but there won't be an appreciable difference between RAM B at 1600 7-7-7, and RAM B at 1066 5-5-5... (And there will be an attendant increase in power consumption, current through the memory controller, and heat dissipation all around at 1600)