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ep45-ud3p 1.0 Win 7 Ram problem

post #1 of 4
Thread Starter 
I ran xp 32 bit for 2 years with no problems. I finally decided to upgrade to Win 7 since I had 6gb and I felt I needed to take advantage of that.

I had numerous problems with the Win 7 ultimate install, but the major problem stemmed from the ram. I took out 4gb and left 2 in it and it installed fine.

2x1gb cm2x1024-6400c4 4 4-4-12 2.10v ver 6.2
2x2gb cm2x2048-6400c5 5-5-5-18 1.90v ver4.2

I had all sticks in xp 32 bit no problems at all.
2 1gb sticks in ram slots 3 and 4 no problems in Win 7.
1gb and 2gb sticks in 3 and 4 no problems in Win 7.
Cannot use 2 2gb sticks in 1,2 and 3,4 bsod errors in win 7.

why is this a problem in Win 7 not Xp?
And was it the ram timings that caused this? If so why not in XP?
What ram should I buy seems many users have success with G.Skill, but after numerous reading I know my mobo picky about ram. Is it the timings of the ram more than the manufacturer that makes it picky?
I just wanna get some good ram and not worry about this ever again.

Thanks ahead for any suggestions and I hope this made sense.
Hanamichi
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Hanamichi
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WD Windows 7 Ult 64 bit Asus mk700 w mouse 
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post #2 of 4
Hmm, I think I understand you, and this may be your problem. My guess would be that your RAM is incompatible at stock timings, and that it worked under XP because only one set was being used. We know that either set alone works under Win 7 ultimate, so just use the 4GB set. If this is the problem, it may be possible to change some setting/timings in your BIOS to get the DIMMs to work together. This is just an educated guess.

EDIT: After rereading your post I realized I had misunderstood you. Your trying to run 2x2GB in slots 1&2, which is against the recommendations of the manual. This is straight from page 17.

Due to chipset limitation, read the following guidelines before installing the memory in Dual Channel mode.

1. Dual Channel mode cannot be enabled if only one DDR2 memory module is installed.
2. When enabling Dual Channel mode with two or four memory modules, it is recommended that
memory of the same capacity, brand, speed, and chips be used and installed in the same
colored DDR2 sockets for optimum performance.

When memory modules of different capacity and chips are installed, a message which says
memory is operating in Flex Memory Mode will appear during the POST. Intel® Flex Memory
Technology offers greater flexibility to upgrade by allowing different memory sizes to be
populated and remain in Dual Channel mode/performance


Did you have the 2x2GB DIMMS in slots 1&2, and did you see this message about flex memory during post while using XP 32 bit? If so your PC was only utilizing one stick of each set of ram because XP can't recognize more than 3.5GB of RAM, and I don't think a single DIMM can be partially utilized. Unless I am wrong, I have a hunch that one of the 2GB sticks is bad.

If a bad DIMM is the issue, getting new RAM would solve the problem, but I would test them one at a time first with SB coming out soon. Who knows, you might decide to upgrade.
Edited by SyveRson - 12/23/10 at 11:34am
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post #3 of 4
Set your MCH core voltage to 1.26V as you`re using all DIMM slots..

Set your memory multiplier to 2.0..

Set your memory voltage to 2.0V

Set timings manually to 5-5-5-15

If this doesn`t help then just use 2x2GB of RAM as it would be enough..

CHEERS..
     
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post #4 of 4
Thread Starter 
Thanks for hint. I took your advise and set the bios like u said, but the I recv'd the dreaded boot loop. I took out a 2gb stick and left a total of 4gb in (2x1gb and 1x2gb stick.) And it booted up. Just to make sure ram slots weren't damaged I switched them around. Weirdly enough i checked the bios and all the settings were back to auto. I can live with 4gb, but I would love to know why so many ep45-ud3p boards have this boot problem. Is it voltage of ram or is it the mobo likes certain ram.
Hanamichi
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q9550 @3.19 Gigabyte EP45-UD3P rev 1.0 Evga 9600gt 6gb (2x2) (1x2) Corsair xms2 
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Corsair 600 NZXT Alpha Black Steel 
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Hanamichi
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q9550 @3.19 Gigabyte EP45-UD3P rev 1.0 Evga 9600gt 6gb (2x2) (1x2) Corsair xms2 
Hard DriveOSMonitorKeyboard
WD Windows 7 Ult 64 bit Asus mk700 w mouse 
PowerCase
Corsair 600 NZXT Alpha Black Steel 
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