Does your motherboard's temperature monitoring report a high CPU temperature? Is your heatsink clogged with dust bunnies? Is your CPU fan working properly? If your CPU is really getting hot, maybe you need to remove the CPU cooler, clean it and the CPU, apply a thin layer of thermal paste and then re-attach it.
If your motherboard is dying and you need a new one, the Sandy Bridge option is more appealing for a gaming system than the Llano option. A micro-ATX motherboard like the P8Z68-M Pro
could save you $10-20 vs. an ATX motherboard.
Would you consider the Core i3-2120
for $6 more than the Core i3-2100
? It's 200 MHz faster.
i7-4770K, H70, Gryphon Z87, 16 GiB, HD7950, SSD, 2 HD, Blu-ray, SB ZX, TJ08-E, SS-660XP², 3007WFP+2001FP, RK-9000BR, MX518
i5-3570K, GeminII-S524, P8Z77-M Pro, 16 GiB, HD7770, SSD, 2 HD, Blu-ray, InifiniTV4, NSK2480, 55" TV; Asus UX32VD