[SOLVED] 1GB DIMM installed but only 512mb in windows?

10277 Views 13 Replies 2 Participants Last post by Doby, Dec 7, 2009

Micheal01

Discussion Starter · Dec 3, 2009

Hi.
I recently bought a MSI-MS6741 (K8TM\K8MM) Motherboard and set it all up using an AMD Sempron 3100+ CPU and a 1GB DDR400(PC3200) and an old 250wPSU(has 13A on +12v) and it boots fine,installs windows (XP and Vista)
but i noticed that while i have 1GB Module installed it is only showing 512MB(and it runs like it only has 512mb,very slow on Vista).
I tried to see what was showing in Setup and it only shows speed(Mhz) and CAS Latency but does not show how much memory available? BIOS is AMI 3.31a if you need to know.
Following that i d/loaded Everest 2.0 (from the valuable links this site provides) and it shows the same in there which is querying the SPD i assume for that info so my guess is the board.
The boards manual says it can take 2GB (2x 1GB) and says it supports "unbuffered" DDR400 RAM (and 333/266) so what type of RAM Modules do i need to get this board running 2GB (and showing it in window's).
My guess is either u need to populate both banks with 1GB modules or use 1GB modules @ DDR333?
If you need more info i can post an Everest report with relevant sections(SPD,BIOS,Mobo etc)

Hope someone knows whats goin on here!

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Doby

· #2 · Dec 3, 2009

Re: 1GB DIMM installed but only 512mb in windows?

Try underclocking the ram frequency in setup to 166mhz that will make it run at 333 and see if that helps.

What ram are you using, give us a part# if possible along with any other specs and brand

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Doby

· #4 · Dec 3, 2009

Re: 1GB DIMM installed but only 512mb in windows?

No 3200 is the freqency 1490 is mbytes per second.

I didn't think the frequency change would help but had to try it.

I am beginning to think you got your self mislabled ram all the numbers suggest its a 1 gig stick, it maybe time to fire off a email to kingston.

Any chance you could try the ram in another computer? Or a different stick in this one?

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Doby

· #6 · Dec 3, 2009

Re: 1GB DIMM installed but only 512mb in windows?

If it shows up as 1 gig in the asus board then its not the ram, its showing as 333 ram speed because thats what the asus board runs at and it defaults the ram to that otherwise it would show as 400.

I don't know why memtest is reading it as 1GB test said testing 200k-1024Mb 512M but I bet memtest run on the asus board would show it correct.

So that leads us back to the motherboard as the issue, did you try the stick in both ram slots to see what it lists it as?

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Doby

· #8 · Dec 4, 2009

Re: 1GB DIMM installed but only 512mb in windows?

I'm starting to think that while the manual says it can support 2GB and can support DDR400 maybe it can't support 1GB modules @DDR400 (maybe 1GB chips @DDR333)

Thats why we tried lowering the ram freq, that should have fixed the problem if the board did not support 1 gig @400

In googling around last night I did see one other forum post with your board and kingston ram but it was never resolved.

My guess is its the board and that particular brand of ram if you can barrow another stick to try in it maybe we willsee

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Doby

· #10 · Dec 4, 2009 (Edited)

Re: 1GB DIMM installed but only 512mb in windows?

Thats a good possability that its the board, why not try some crucial ram from newegg I don't think it would cost all that more and its way more reliable then some of the ebay stuff.

Oh yea and if you use crucilas ram configorator at the website and they recomend ram for you board they guaranty it to work

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Doby

· #12 · Dec 5, 2009

Re: 1GB DIMM installed but only 512mb in windows?

I would not order ram you'll most likely get the same result, I would rma the motherboard it should not act like that

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Doby

· #14 · Dec 7, 2009

Re: 1GB DIMM installed but only 512mb in windows?

Glad you got it sorted great job! That is a strange one never seen a cpu do that, I wonder if your board and/or bios don't support the sempron

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