GA-EP45-UD3R & OCZ2RPR10664GK SOLUTION

[dementedbrave]

• OCZ part number:-OCZ2RPR106
• Module size and kit size:-2 x 2gb
• CPU model and rated speed:-Xeon e3110
• Overclocked CPU speed:-4.05ghz
• Divider and FSB used:-1/1
• Motherboard and revision:-1
• Motherboard Bios rev:-f4
• Video card:-gtx260
• Power supply:-******* 750
• Operating System:-xp
• CPU and System Cooling:-thermalright ultra 90
• CPU and System temps:-
• Purchased at/on:-
• Country:-USA
• Memory voltage:-2.06

HI, i have seen a couple of you with this combination of reaper ddr2 and the gigabyte p45 udr3 or similar GB board, and believe me, I feel your pain.
By themselves, these are both good parts but they don't play well together for some reason. I wish I knew that before I bought them.
It took me months to finally figure out how to get this ram to run at rated settings.

The problem with this combination is that it won't run at the default 1066mhz in dual channel. Both sticks will boot up separately and run fine, but not together. So I started playing with the timings and voltage and all that with not much luck. Found out that it would run at a lower clock speed in dual channel and I ended up using a 1:1 divider with my fsb @ 450 mhz which gave me 900 mhz ram speed.

Then I started playing with the dividers to see how high the ram would go. What I wanted to do was run my fsb @450 with the 2.4B divider for 1080mhz. but no matter what timing or voltage I tried it would not go over 1042 mhz with that divider. Would run stable up to that but anything higher just wouldn't boot. I gave up trying for awhile and just stuck to the 1:1 setting.

But a few days ago I thought I'd give it another try. The only thing left was to try was different dividers, and I found the one that worked. Trying the 2.5A divider let me take the memory up to 1100mhz stable, even with pretty tight timings and low voltage. I was hoping I could get it up to 1125mhz so I could run my cpu @ the 4.05ghz I was used to, but memtest was throwing errors at that speed. I will keep playing with it to find out what works, some people have claimed to reach 1200 with this ram.

Anyway I hope this helps, although it might not be what you want to hear. Just start out with both sticks in dual channel running @ 800 mhz. then try out the different dividers and raise the fsb higher and higher. the 2.5A is a good place to start. Which is weird, because the mods in the forum always suggest that the D and C dividers usually work the best. I guess the main thing though is that the GA-EP45-UD3R & OCZ2RPR10664GK aren't very compatible, and I wouldn't waste time trying to return them thinking they are faulty, just go with another combination. Me however, I like a challenge. lol

Oh yeah, since I can't post in others threads- moderators, please pass this info along to anyone else with this problem or direct them to this thread. thanks

[dementedbrave]

Heres some more help....

This board seems to HATE the D (400) divider, or at least the 2.66D one

try the C (200) divider instead....

wouldn't boot with 2.66D (400fsb x 2.66d = 1066)
but changed to 2.66C and it worked great


Here is a good setting if you want a modest OC on your processor and 1066 memory speed
Use 2.66C divider
8 x 400fsb for 3.2ghz - all e8400's should be able to handle this speed at default volts
or 9 x 400fsb for 3.6ghz

Also found other users having problems with this board and ocz memory other than the reaper set, so its all the boards fault lol

[RyderOCZ]

Thank you.

[dementedbrave]

I did some more testing with some older crucial ballistix 800 ram i had. It seems like it has the same problem with dividers as the ocz ram. I tried using the 2.4B divider and it would be fine up to 1042 but anything higher wouldn't boot. With the C divider I reached the memory's limit of around 1060.

So it would seem that the problem is completely the motherboards fault. Maybe it is a common defect and you might get lucky returning it for a new one. But its a pain switching motherboards, and I like everything else about this one. Oh well, maybe something will happen with a new bios revision

[RyderOCZ]

Yes, a bios update could fix this, if they pay attention and notice it.