Recommended Memory for GA-EP45-UD3P

8GB of G.Skill DDR2 800 works fine: http://www.newegg.com/Product/Prod [...] 6820231209

It automatically detected them and set the timing at 4-4-4-12 and 1.8V.

It's 800 Mhz memory that's guaranteed to overclock to 1000 Mhz or 1066 Mhz (with increased timings and voltage). There's no JEDEC specification for it, therefore you'd have to set timings and voltage manually. The performance gains could be anywhere between 0 and 1.5% (depending on applications). You could also overclock DDR2 800 Mhz memory and probably achieve the same results.

The risk of running into issues always is lower when using memory that's known to work well with your motherboard.

That's correct. Check today's build on Tom's and you'll see that they also use G.Skill PI Black DDR2 800 Mhz to build affordable systems. By default, 1066 RAM will work at 800.