RAM Compatibility

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Yes, the Kingston kit is compatible.

A780L3G Ver. 6.x - http://www.biostar.com.tw/app/en/mb/introduction.php?S_...
Support Dual Channel DDR3 800/1066/1333 MHz
2 x DDR3 DIMM Memory Slot
Max. Supports up to 8GB Memory ; 2 slots = 2x4GB

KHX1333C9D3B1K2/8G - http://www.ec.kingston.com/ecom/configurator_new/partsi...
DDR3 1333 8GB (2 x 4GB)

Thank you very much!

Keep in mind, to access >4GB of RAM (memory) you'll need a 64-bit OS; in contrast 32-bit is limited to 4GB with 3.0GB~3.5GB usable.

Okay, so would Windows 7 Ultimate work, or would I need something different?

It will as long as it's the 64-bit version.

Depends, if it's 64-bit then sure. Unless you need the features and extras of 'Ultimate' then look at Windows 7 Home Premium 64-bit (16GB max) ; see - http://msdn.microsoft.com/en-us/library/windows/desktop...(v=vs.85).aspx#physical_memory_limits_windows_7

Windows 7 Editions - http://windows.microsoft.com/en-US/windows7/products/co...
I typically use Pro x64 and an added feature is Windows XP Mode which allows you, if needed, to run Windows XP applications in a 'Virtual PC'.

Option:
Another consideration is Windows 8 Preview for now and once available it's a $39.99 upgrade from XP or later Windows OS.

Windows 8 Preview - http://windows.microsoft.com/en-US/windows-8/iso
Use Win7 x64 drivers per the link to your MOBO above.

Okay, thank you. I appreciate your help