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afterdawn.com > forums > pc hardware > other pc hardware > ddr400 dram speed drops to 333mhz with 4 strips!?
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DDR400 DRAM speed drops to 333mhz with 4 strips!?
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MaccerM
Member
_ 		29. November 2007 @ 14:40 _ Link to this message    Send private message to this user   
I am a relative noob when it comes to Athlon 64 chips and their motherboards with their HTT etc as opposed to the good old FSB!
My brother has a A64 3200+ in an Asus A8V-VM (cheapo) motherboard. I recently helped him change one of his ram stips (4x 512mb Corsair Value Select DDR400) as he had 3 double sided strips and one single and the DRAM wasn't running dual channel. Also, the bios post would say DRAM Speed 333mhz. I have got him a double sided strip so all 4 match and I have noticed something curious.
When you have one pair installed (either pair) it boots up saying
Dram 400mhz
Dual channel mode 128bit

However when you install the other pair the dram speed always drops down to 333mhz again.
Anyone have any idea why? What can I do to get it up to the rated speed?
[ + quote]
Q9550 @ 3.4Ghz-1.275v & TRUE, Asus P5N-T Deluxe, 4Gb Dominator 1066 (5-5-5-15), Inno3d OC 8800GTs in SLi with TT Duorbs, 580w 5.1 Setup, 2x DVD-RAM, 320&160Gb SATA2 HDDs, 17" 3ms Hyundai TFT, 700w Jeantech PSU.
cee43ja1
AfterDawn Addict
_ 		29. November 2007 @ 15:20 _ Link to this message    Send private message to this user   
to guarantee dual channel, all four sticks should be the same brand and types. i think using different brands won't enable dual channel (can be wrong, someone correct me if i am)
[ + quote]
ps2: v7 scph-39001 - independence exploit - hdloader 0.8c - maxtor 300gb hdd
(+[__]%) psp slim ta-085v1: 6.60 PRO B10
wii (powered by bootmii/priiloader): 4.1u - d2x v10beta53-alt (base 56) - configurable usb loader v70r51/devolution r188 - wd scorpio black 7200rpm 320gig w/ ams venus ds2 enclosure

got a whole lot more to list . . .
MaccerM
Member
_ 		29. November 2007 @ 15:33 _ Link to this message    Send private message to this user   
They are all corsair VS512400's. All 16x32 mb double sided strips. Two of them are a matched pair (i.e the serial no.s are 1 different) Both pairs work individually in dual channel mode at 400 mhz, but when you use all four strips the bios post says they're in dual channel but at 333mhz!?
As I've said, both the pairs will boot in dual channel mode at 400mhz when you just use a single pair - surely this would mean that there isn't a problem with the matching of the two that have different serials - otherwise those two wouldn't boot in dual channel when by themselves?
[ + quote]
Q9550 @ 3.4Ghz-1.275v & TRUE, Asus P5N-T Deluxe, 4Gb Dominator 1066 (5-5-5-15), Inno3d OC 8800GTs in SLi with TT Duorbs, 580w 5.1 Setup, 2x DVD-RAM, 320&160Gb SATA2 HDDs, 17" 3ms Hyundai TFT, 700w Jeantech PSU.

This message has been edited since posting. Last time this message was edited on 29. November 2007 @ 17:28
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cee43ja1
AfterDawn Addict
_ 		29. November 2007 @ 15:44 _ Link to this message    Send private message to this user   
i think if you use two matched pair sets, then dual channel should run at 400. (still can be wrong)

is there any settings in the bios where you can change the ram speed? if there is, change it from auto to ddr400; this will make it run at 400mhz no matter what.
[ + quote]
ps2: v7 scph-39001 - independence exploit - hdloader 0.8c - maxtor 300gb hdd
(+[__]%) psp slim ta-085v1: 6.60 PRO B10
wii (powered by bootmii/priiloader): 4.1u - d2x v10beta53-alt (base 56) - configurable usb loader v70r51/devolution r188 - wd scorpio black 7200rpm 320gig w/ ams venus ds2 enclosure

got a whole lot more to list . . .
afterdawn.com > forums > pc hardware > other pc hardware > ddr400 dram speed drops to 333mhz with 4 strips!?
 

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