ASRock P55 Extreme4 motherboard specifications

Form factor:	ATX 305mm x 244mm
CPU socket type:	Socket 1156
Chipset:	Intel P55
Motherboard features:	Solid capacitors
USB:	1 x USB 3.0 (front, 2 ports) 2 x USB 3.0 (backpanel) NEC MPD720200 USB controller
Internal connectors:	1 x Clear CMOS switch with LED 1 x Power switch with LED 1 x Reset switch with LED
Supported Operating System(s):	Microsoft Windows 7 Microsoft Windows 7 (64-bit) Microsoft Windows Vista Microsoft Windows Vista (64-bit) Microsoft Windows XP Microsoft Windows XP (64-bit)

NOTE: specifications are not complete

ASRock P55 Extreme4 CPU compatibility list

Part Number	Frequency	Features	BIOS	PCB	Notes
Intel Core i3
BX80616I3530 BXC80616I3530 CM80616003180AG	i3-530	2.93 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I3530 BXC80616I3530 CM80616003180AG	i3-530	2.93 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I3540 BXC80616I3540 CM80616003060AE	i3-540	3.06 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I3540 BXC80616I3540 CM80616003060AE	i3-540	3.06 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I3550 BXC80616I3550 CM80616003174AJ	i3-550	3.2 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
Intel Core i5
BX80616I5650 BXC80616I5650 CM80616003174AH	i5-650	3.2 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I5650 BXC80616I5650 CM80616003174AH	i5-650	3.2 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I5655K CM80616003174AO	i5-655K	3.2 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I5660 BXC80616I5660 CM80616003177AC	i5-660	3.33 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I5660 BXC80616I5660 CM80616003177AC	i5-660	3.33 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I5661 BXC80616I5661 CM80616004794AA	i5-661	3.33 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 87W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I5661 BXC80616I5661 CM80616004794AA	i5-661	3.33 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 87W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I5670 BXC80616I5670 CM80616004641AB	i5-670	3.46 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616I5670 BXC80616I5670 CM80616004641AB	i5-670	3.46 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BX80616I5680 BXC80616I5680 CM80616004806AA	i5-680	3.6 GHz, 133 MHz BLK, 4 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
BV80605001911AP BX80605I5750 BXC80605I5750	i5-750	2.66 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605003213AH BX80605I5750S	i5-750S	2.4 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 82W, Stepping B1	P1.10
BV80605001908AN BX80605I5760 BXC80605I5760	i5-760	2.8 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
Intel Core i7
BV80605004494AB BX80605I7870S	i7 870S	2.66 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 82W, Stepping B1	P1.10
BV80605001908AK BX80605I7860 BXC80605I7860	i7-860	2.8 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605003210AD BX80605I7860S	i7-860S	2.53 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 82W, Stepping B1	P1.10
BV80605001905AI BX80605I7870 BXC80605I7870	i7-870	2.93 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605004494AB BX80605I7870S	i7-870S	2.66 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 82W, Stepping B1	P1.10
BV80605001905AM BX80605I7875K	i7-875K	2.93 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605002505AG BX80605I7880	i7-880	3.06 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
Intel Pentium Dual-Core
BX80616G6950 BXC80616G6950 CM80616004593AE	G6950	2.8 GHz, 133 MHz BLK, 3 MB cache, Clarkdale, 73W, Stepping C2	P1.10		The Intel HD Graphics feature will not work.
BX80616G6950 BXC80616G6950 CM80616004593AE	G6950	2.8 GHz, 133 MHz BLK, 3 MB cache, Clarkdale, 73W, Stepping K0	P1.10		The Intel HD Graphics feature will not work.
CM80616005373AA	G6960	2.93 GHz, 133 MHz BLK, 3 MB cache, Clarkdale, 73W, Stepping K0	P1.70		The Intel HD Graphics feature will not work.
Intel Xeon
BV80605004737AA BX80605L3426	L3426	1.86 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 45W, Stepping B1	P1.10
BV80605001914AG BX80605X3430	X3430	2.4 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605002517AQ BX80605X3440	X3440	2.53 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605001911AQ BX80605X3450	X3450	2.66 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605001908AL BX80605X3460	X3460	2.8 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10
BV80605001905AJ BX80605X3470	X3470	2.93 GHz, 133 MHz BLK, 8 MB cache, Lynnfield, 95W, Stepping B1	P1.10

When part numbers are not supplied by motherboard manufacturers, we use best guess approach to determine part numbers based on CPU model, frequency and features. In some cases our guess may be incorrect or incomplete. Please always verify part numbers before committing to buying the CPU.