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MSI 790x G45 FSB:RAM Ratios

post #1 of 9
Thread Starter 
First off, I apologize if this has been answered elsewhere. I searched as thoroughly as possible, but couldn't find any specific answers to my questions
If someone does has a sticky/link, please feel free to post it.

I have this Mobo:

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130249&cm_re=MSI_790x-g45-_-13-130-249-_-Product

And this RAM:

http://benchmarkreviews.com/index.php?option=com_content&task=view&id=479&Itemid=67

(though mine is 4x2Gb)


My mobo is rated for 800/1066/1200(OC) RAM Frequencies

I was able to get my CPU to 3500Mhz @ 14x (1.45v),and my FSB to 250Mhz.

However, at these speeds, the only ram ratio I have that qualifies for my Mobo's Freq ratings is 1:2, which puts me at 1000Mhz for my Ram (500Mhz DRAM)

At 1:2.66 my RAM is at 1337Mhz which exceeds the JDEC/RAM ratings for my board (and does become unstable after about 4 hours of heavy use)

Here's my question:

Since I only have 4 ratios to pick from: 1:2, 1:2.66, 1:3.33, or 1:4

The ONLY Ratio that falls under spec for my Mobo is 1:2, but my RAM will go to 1600Mhz, and my Mobo will support up to 1200Mhz..

How do I get to that 1200Mhz without lowering my FSB or CPU? Or can I at all?

I heard something about "synchronous/asynchronous" FSB:MEM ratios?

Anyone have any advice?
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Big Blue
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post #2 of 9
If the 925 is a C2 revision, you will not be able to run 1600Mhz with all 4 DIMMs. At most 1450Mhz perhaps. Motherboard memory support is not an issue. More DRAM voltage helps on C2 revision.
post #3 of 9
Thread Starter 
Quote:
Originally Posted by xd_1771;12060146 
If the 925 is a C2 revision, you will not be able to run 1600Mhz with all 4 DIMMs. At most 1450Mhz perhaps. Motherboard memory support is not an issue. More DRAM voltage helps on C2 revision.

Thanks for the advice!

CPU-Z says REVISION: RB-C2

My goal isn't really so much as to exceed the Mobo/CPU tolerances on an OC massively, but to really just get as much out of it as safely possible. Therefore my goal is to try to get 1200Mhz on my RAM, which is the max rating of the Mobo, instead of sitting at 1000Mhz, which would seem personally embarrassing, considering how far I got my chip.

Any ideas how to do that?

Thanks!

T.
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post #4 of 9
Bump up the DRAM voltage above rated a few notches. Really helps on the C2. Perhaps you should set your goal to 1333Mhz. Loosen your timings while increasing speed; tighten them when you're done.
post #5 of 9
Thread Starter 
Quote:
Originally Posted by xd_1771;12060767 
Bump up the DRAM voltage above rated a few notches. Really helps on the C2. Perhaps you should set your goal to 1333Mhz. Loosen your timings while increasing speed; tighten them when you're done.

So no possibility of altering FSB:RAM ratios to fit 1200Mhz with this Mobo? I figured... Can Mobo's rated for a lesser Mhz run stable on a 150Mhz over-clock?

I had my DRAMv set at 1.71v @ 1333Mhz prior, and I was experiencing a few BSOD's during memory intensive operations, but strangely enough not during Prime95... Thoughts?

Currently: DRAMv = [Auto] and Memory @ 1:2 = 1000Mhz ~ no BSOD.

The Mobo Starts with a stock voltage rating on the DRAM of 1.50v

I am concerned about raising my DRAMv too much farther, as it appears the Patriot Memory is rated for 1.8v, but I was not able to figure out if that was a stock voltage rating, or a max voltage rating. Thoughts here? Is this a valid concern?

By "loosen my timings" do you mean go from stock 5-5-7-10 (or whatever it is) to something like 9-9-9-24 during the overclock, and then return it.. When?

Thanks in advance.
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post #6 of 9
How it works on modern AMD systems is via multiplier, not FSBRAM ratio. Times have changed. You may need to loosen memory timings in order to run at higher speeds of course. It's sort of a given.
post #7 of 9
Thread Starter 
Thanks for all your help!

I determined that at 1333Mhz I had to run 8-8-8-20 or slower (9-9-9-24) in order to get my RAM stable @ 1.71v. The voltage was to high for my comfort, considering the low net gain.

DDR3 1000Mhz @ 6-6-6-15 I believe, from what I've read, would actually outperform DDR3 1333Mhz @ 9-9-9-24, and I don't have to screw with the voltages, so for now, I've just left it stock.

I've decided just to make sure in the future I purchase a Mobo with a high RAM Mhz ceiling.

Thanks again!

T.
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Big Blue
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post #8 of 9
Hey I have the same Motherboard as you, MSI 790X G-45. Do you know if it can support 16 GB DDR3? B/c i have seen places that say you can support that much if it is unbuffered but I don't really know what to do. I have 4 GB now and i am looking to upgrade to either 8 GB or 16 GB. My Rig is an AMD Phenom II X2 560 BE UNLKD -->X4 B60 @3.53 GHz. And I currently have 2 DIMM slots occupied and 2 un-occupied(obviously).
post #9 of 9
Quote:
Originally Posted by thirteenthcor View Post

I've decided just to make sure in the future I purchase a Mobo with a high RAM Mhz ceiling.
The RAM "ceiling" is in the CPU IMC or in the chips on the RAM sticks themselves not on the mobo.
   
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WD Sony Corsair H60 Mepis Tetris 
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A4 Crap Mionix Anus Xonar D1 
CPUMotherboardGraphicsRAM
AMD Athlon 5150 ASUS AM1M-A  IGD Crucial 2X2G 
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