memory only running at 400mhz?

B

brentduo

New Member
Ok i have 4gigs of ocz pc6400 800mhz memory, CPU-Z says I'm only running at 400mhz. How do I clock the memory? my Mobo is a evga 650i ultra, running xp.
 
400MHz is correct - it's DDR2, DDR standing for Dual Data Rate, so while it's only running at 400MHz it's effectively running at 800MTs (MegaTransfers per second). Any DDR memory (DDR,DDR2,DDR3,...) does this - memory rated at DDRn-XXX runs only at half the MHz of the rated speed, XXX.
 
What CPU-Z is showing is simply one of the dual 400mhz memory channels that when totaled equal 800mhz(400mhz x 2channels = 800mhz). Look familiar? The image below was just taken here for the 2gb of PC6400 DDR2 800 memory in use running stock.

 
What hackapelite said is right, has nothing to do with single or dual channel memory controllers. It just can transfer data on the rising and falling edges of one clock cycle. Hence dual data rate
 
What CPU-Z is showing is simply one of the dual 400mhz memory channels that when totaled equal 800mhz(400mhz x 2channels = 800mhz).
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LAWL!!!!
No, PC eye, running memory in dual-channel has nothing to do with this. As I said, Dual Data Rate memory is rated as twice the actual MHz, that's why DDR2-800 actually runs at 400MHz, and DDR2-667 runs at 333MHz... and my DDR-400 runs at 200MHz ;)
 
tyttebøvs said:
I think hackapelite gave the correct answer.
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If you want to get into theory it's actually referring to the bus bandwidth in megaseconds or double pumped, dual pumped, and dual transition. But it's still equivalent to two virtual channels by math.

brentduo you will have to ignore the thread hijacking since that goes on enough already. :rolleyes:
 
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PC eye said:
If you want to get into theory it's actually referring to the bus bandwidth in megaseconds or double pumped, dual pumped, and dual transition. But it's still equivalent to two virtual channels by math.

brentduo you will have to ignore the thread hijacking since that goes on enough already. :rolleyes:
Click to expand...

Damn, you're good.
 
This is going to be another good one. The crap that spills from within. Whatever PC eye thinks is right, is right. Regardless of facts.
 
If you want to get into theory it's actually referring to the bus bandwidth in megaseconds or double pumped, dual pumped, and dual transition. But it's still equivalent to two virtual channels by math.
Click to expand...
Megaseconds? If mega equals million, megasecond would be...million seconds? What do "megaseconds" have to do with this?

And no, it's not referring to the bus bandwidth, it's referring to effective speed, or transfers per second. Running memory in dual-channel would double the bandwidth from 128 bits to 256 bits, running dual data rate memory doubles the effective/rated speed - those things have nothing to do with each other apart from the fact that they increase total memory throughput.

And no, there are no "virtual channels". Dual Data Rate memory effectively handles twice the transfers as opposed to running Single Data Rare memory, it doesn't create a "virtual channel" or anything like that.
 
Its a typo - misunderstanding - dont get it - missed something - In other words - I meant another chipset - I was explaining something else - keyboard key stuck - tombstones - some kinda of DDR support on the XP 3200- extra wide IDE cables - uninstalling USB drivers will crash windows - The 8mb. of unallocated space is a flaw in windows setup - change the subject - hijacking threads - slander attack.

dual 400mhz memory channels that when totaled equal 800mhz(400mhz x 2channels = 800mhz). Look familiar?
 
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