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I'm considering purchasing Kingston HyperX 4GB . I believe it has 2000 Bus.and i have a gigabyte G41M-Combo which support DDR3 1333 . Will that work?

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You haven't mentioned the exact model/part number. There are lots o HyperX memories, with different speeds. – Sathya Oct 9 '10 at 20:32
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You haven't mentioned which part number. If it's KHX2000C9AD3K3/3GX this then from the datasheet (linked to PDF):

The SPDs are programmed to JEDEC standard latency DDR3-1333MHz timing of 9-9-9 at 1.5V.

Translated: The memory should run fine, but the 2000MHz speeds are only under overclocked conditions.

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I don't know exactly. I'm just considering upgrading my ram. Maybe I can rephrase the question to : If the RAM Bus speed is bigger than the motherboard's will it run? – Mohamed Oct 9 '10 at 21:00
It depends,the RAM modules are likely to sync with the bus speed, and slow down. – Sathya Oct 9 '10 at 21:09
All the models? – Mohamed Oct 9 '10 at 21:50
Yep, as long as the RAM types match. If yo're adding the modules in adddition to your existing RAM modules - best to either remove the old modules or match the modules wrt speed and latencies. Unmatched RAM modules often result in stability problems and BSODs – Sathya Oct 9 '10 at 21:56

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