£150 would be the max budget.
The x8 SLI/CF for UD4 vs x16+x4 CF for UD3R.
I'm struggling to see the difference between the UD3R and the UD4.
Worth the extra?
Gigibyte or Asus.. Decisions decisions!
Comparison
Gigabyte GA P55 UD3 or Asus P7P55D - I would choose the Asus...
Gigabyte GA P55 UD4 or Asus P7P55D Evo - I would also choose the Asus...
Reason for prefering the ASUS boards?