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Overclocking Summary

Going For 4GB: DDR2-1066 Kit Round-Up
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The following table lists the maximum overclocking speeds we reached at a common 2.3 V memory supply voltage. Although it is possible to apply more voltage, we do not recommend doing this for permanent system operations, considering that 1.8 V is the default voltage for DDR2 memory and the stated 2.0 to 2.3 V of the memory vendors are already based on selecting memory chips that support higher clock speeds at higher voltages. Hence, 2.3 V is the maximum we’d be willing to accept. 2.4 V and up will not even give you substantially more clock speed anyway.

Specified Timings OC Voltage Labeled DDR2 Speed Reached OC DDR2 Speed
Corsair Dominator TWIN2X4096-9136C5DF 5-5-5-18 2.3V 1142 1176
Crucial CT2KIT25664AA1067 7-7-7-24 2.3V 1066 1091
GeIL EVO ONE GE24GB1066C5DC 5-5-5-15 2.3V 1066 1140
Kingston HyperX KHX8500D2K2/4G 5-5-5-18 2.3V 1066 1130
Mushkin Ascent XP2-8500 5-5-5-15 2.3V 1066 1115
OCZ FLEX XLC PC2-9200 Flex II 4 GB Series 5-5-5-15 2.3V 1150 1180
Chaintech Apogee GT AU2G732-12GH001 5-5-5-18 2.3V 1200 1188

All enthusiast-class memory, with the exception of Chaintech’s Apogee GT series, was able to overclock from the default DDR2-1066 speed to DDR2-1115 (Mushkin) and up to DDR2-1180 (OCZ, Corsair). Crucial’s memory kit didn’t go as far, but it’s not an enthusiast product, and it doesn’t even have a heat spreader.

Clearly, there aren’t any large overclocking margins for users to take advantage of. The table shows the overclocking results of each product relative to its specified speed, and using specified timings at a common 2.3 V voltage. The Walton Chaintech Apogee GT only reached 99%, as it failed to reach its specified DDR2-1200 speed. All others provide between 2% and 7% overclocking margin, which really isn’t a lot.