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Overclocking

Seven Sub-$160 Z77 Express Motherboards, Reviewed
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BIOS Frequency and Voltage settings (for overclocking)
 ASRock
Z77 Extreme4
Asus
P8Z77-V LX
Biostar
TZ77XE3
CPU Base Clock95-150 MHz (1 MHz)80-300 MHz (0.1 MHz)95-300 MHz (0.01 MHz)
CPU MultiplierUp to 63xUp to 63xUp to 63x
DRAM Data Rates1066-2800  (200, 266.6 MHz)800-3200  (200, 266.6 MHz)1066-2800  (200, 266.6 MHz)
CPU Vcore0.60-1.70 V (5 mV)0.80-1.99 V (5 mV)1.00-1.79 V (10 mV)
VTT Voltage0.77-1.63 V (10 mV) 1.05-1.70 V (12.5 mV)
VCCSA Voltage0.93, 1.02, 1.11, 1.20 V 0.74-1.69 V (5 mV)0.90-1.70 V (12.5 mV)
PCH Voltage0.78-1.65 V (9.3 mV)0.74-1.69 V (5 mV)1.05 V +0 to +15% (5%)
DRAM Voltage1.17-1.80 V (5 mV)1.19-2.14 V (5 mV)1.30-2.11 V (12 mV)
CAS Latency4-15 Cycles1-15 Cycles4-15 Cycles
tRCD3-15 Cycles1-15 Cycles3-15 Cycles
tRP3-15 Cycles1-15 Cycles3-15 Cycles
tRAS9-63 Cycles1-255 Cycles9-63 Cycles
BIOS Frequency and Voltage settings (for overclocking)
 ECS
Z77H2-A2X Deluxe
Gigabyte
Z77X-D3H
Intel
DZ77SL-50K
MSI
Z77A-G45
CPU Base Clock99-150 MHz (1 MHz)80-133.33 MHz (0.01 MHz)100-300 MHz (1 MHz)0-655 MHz (0.1 MHz)
CPU MultiplierUp to 59xUp to 63xUp to 255xUp to 63x
DRAM Data Rates1066-2800 (200, 266.6 MHz)800-3200 (200, 266.6 MHz)1066-2400 (266.6 MHz)800-2933 (200, 266.6 MHz)
CPU Vcore1.00-1.50 V (25 mV)0.80-1.90 V (5 mV)1.00-1.92 V (5 mV)0.81-1.52 V (5 mV)
VTT Voltage+0 to +0.63 V (10 mV)0.80-1.70 V (5 mV)1.00-1.80 V (5 mV)0.95-1.55 V (10 mV)
VCCSA Voltage+0 to +0.63 V (10 mV)0.72-1.40 V (5 mV)0.85-1.75 V (5 mV)0.87-1.51 V (10 mV)
PCH Voltage+0 to +0.63 V (10 mV)Not Adjustable1.00-1.50 V (12.5 mV)0.78-1.73 V (5.5 mV)
DRAM Voltage+0 to +0.63 V (10 mV)1.10-2.10 V (5 mV)1.20-1.80 V (50 mV)1.11-2.47 V (7.25 mV)
CAS Latency4-15 Cycles5-15 Cycles2-255 Cycles5-15 Cycles
tRCD3-15 Cycles4-15 Cycles2-255 Cycles4-15 Cycles
tRP3-15 Cycles4-15 Cycles2-255 Cycles4-15 Cycles
tRAS9-63 Cycles5-63 Cycles5-65535 Cycles10-40 Cycles


In spite of cooling differences, Asus’ hot-running P8Z77-V LX tops our CPU overclocking chart, while MSI’s cold-blooded Z77-G45 falls to the bottom.

Gigabyte’s Z77X-D3H takes the lead in base clock, accomplishing the highest reference frequency this processor has ever seen! This astonishing feat should be most significant to builders who can’t afford one of Intel’s unlocked K-series processors.

Intel uses 21.33x as its highest memory multiplier, and doing so leaves the DZ77SL-50K stuck with sub-2200 MT/s data rates. ASRock and Asus are on par, with MSI only slightly behind.

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