http://pcpartpicker.com/b/Bqpbt6
The objective of this build was to get a gaming computer that could be ultra portable and keep it under a budget of $800. I've been looking at these 20th Anniversary Pentiums for a while and decided to give it a try.
MOBO: MSI Z87I AC this motherboard is still the 1150 platform, so it is easily upgradable if the owner doesn't want to stick with the Pentium, plus it fit into the case and has built in WIFI.
Case: I used the Lian Li PC-TU100B, but I could've gone with a Corsair 250D and saved a decent amount of cash that way. However, the Lian Li has a carrying handle and that's just freaking cool when you want to take it places.
CPU: Intel Pentium 20th Anniversary Edition "G3258" because it overclocks like a beast. This one was easily set to 4.4Ghz.
CPU COOLER: Corsair H55 AIO water cooler. I've used this in my other build and it helped tremendously with my AMD 760k. Afterwards, I'm not sure that it was necessary because the Intel chip stays fairly cool with the 22nm build process and only having 2 cores, its only a 53w TDP
RAM: 4GB (2x2GB) Corsair DDR3-1333Mhz because it was cheap.
GPU: I went with a GTX760 although a 750ti probably would've worked ok.
PSU: Silverstone SFX 450w non-modular 80+Gold, it fits and it works really well.
HDD: Hitachi Travelstar 1TB 7200RPM 2.5" laptop hard drive. It fit into the case well and it has plenty of storage.
Overall, I'm pleased with the build. It plays games very well with the exception of heavier cpu games like BF4 and then I can just turn some of the settings down. I'd like to see an SSD in there soon, then add another 4GB of RAM, and after all that if its worth it bump up to an i5, but this was a great entry level gaming computer.
Benchmarks
BioShock Infinite Benchmark (UltraDX11_DDOF settings at 1080p) Overall Scores: Avg FPS 69.33, Min FPS 13.21, Max FPS 187.41
3DMark11 Results (Run All Tests Basic Edition) Overall Scores: Fire Strike 4760, Cloud Gate 11172, Ice Storm 98623
Unigine Valley Benchmark (DX11 1920x1080 4xAA) Avg FPS 26.1, Score 657, Min FPS 6.8, Max FPS 62.2
Unigine Heaven Benchmark (DX11 1920x1080 4xAA) Avg FPS 45.1, Score 1886, Min FPS 11.4, Max FPS 92.8