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Help with o/cing an Opteron 146

post #1 of 10
Thread Starter 
Hey everyone, Im very new to overclocking, I have an AMD Opteron 146 (skt 939) which is stock at 2.0ghz with a 10x multiplier. I have an Asus A8N-SLI motherboard, and a Thermaltake Big Typhoon cpu cooler with very good airflow in my case. I have some generic PC3200 DDR400 sticks (4 x 512) Running at 2.5cl in dual channel mode right now, and have been able to up my FSB to 240 (while not changing anything else like voltage or memory speeds) and its running stable but wont go any higher... I would like to get atleast a 260FSB or even 280FSB if possible, and I think I need new memory to do it. So my question is what speed memory should I buy? All i want to do is up the FSB and thats it... if i have to change voltage thats fine but i dont want to lower anything to get a higher fsb, that doesnt seem to make sense, I just want the FSB to be 260 or 280 so my processor will run at 2.6ghz or 2.8ghz. I am so lost as to which memory to buy to do this, pc3200 or pc4000. Also need help in what I should change cpu voltage to, if I should change chipset voltage, what the heck a memory divider is, what i should put the hyper transport at, etc. Any help would be greatly appreciated. Thanks guys!
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post #2 of 10
If your memory is running at 240MHz then you are doing good, and the fact that is value type memory you are doing excellent. A lot of overclocking grade memory can not do 240MHz. Throw in a divider and you will be able to push your cpu higher. Try that out. Run it 166MHz or however you do with the Asus board.
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post #3 of 10
disclaimer: im still a newbie at this, so someone please correct me if im wrong about anything

anyways...what kind of mem EXACTLY do you have? if you have mixed mem it might be a little tricky. if you have 2 sticks of 2 different mem then make sure they are in the right dual channel config:

slot 1: 512 brand 1
slot 2: 512 brand 2
slot 3: 512 brand 1
slot 4: 512 brand 2

you might want to try 2 sticks at a time in dual channel config to test the mem individually to see which would give you a better overclock.

start raising the fsb slowly by 5-10 MHz and leave the multi @ 10.

if windows doesnt start up then try upping the vcore a bit. a little trick that has kind of been working for me is leaving the vcore low, but raise the vid special (+104%, 110%, 123%, etc)

make sure to check your temps and make sure vcore doesnt go above 1.5v (for now) and CPU temp doesnt go beyond 45C or so. i have the BT as well and my load temps are ~39C @ 3 GHz.

hope this helps.
    
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post #4 of 10
If Joey... is getting 240MHz with 4x512MB of memory it is my opinion that he does not really need anything new. Some people with overclocking quality mory in a 4x512MB configuration can not run a 10MHz overclock.

If you have your heart set on running at a 1:1 ratio then you would want to buy a PC4000 ram so your native frequency will be 250MHz. G-Skill PC4000 Extreme memory gets people around 270MHz typically. That might be great way for you to go if you want to buy some new memory.
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post #5 of 10
For HT multiplier,you'll want to drop it to 3x if your going over 250, which you seem to want to do. As well go with the divider for now, as your cpu will be faster. However. You may end up benhing slower. when you set memory to 166, it's a divider. Think 166/200 (= .83) x system bus (you have at 240) so your memory will drop back down to 200mhz. then as you raise Bus speed memory will climb in speed again.

For example:

250 x (166/200) = 207.5
260 x (166/200) = 215.8
270 x (166/200) = 224.10
280 x (166/200) = 232.4
290 x (166/200) = 240.7

Realize you may have to bump up chipset voltage to hit the higher clocks. Also, realize Athlons love Tighter timings over bandwidth in a lot of cases. Lower latency can beat out higher mhz for ram performance.
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post #6 of 10
Currently my Athlon 64 3200 is @ 2.8ghz 280 x 10 mem divider 150/200 or .75 for speed of 210.
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post #7 of 10
Thread Starter 
Ok now I'm even more confused, should I buy PC3200 memory which is CL2 and just use a divider of 150/200 and up the FSB to 270 which would yeild a memory 202.5mhz or should I go with the PC4000 which is CL3 but i could run 1:1 with a 260 FSB ? Im so confused and wanted to order this memory tomorrow... please help!
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post #8 of 10
If your sure the memory will run at 260, then I'd go for that. Do you know what the rest of the timings are though? I mean, when i mentioned good timings, it was a larger difference accross the 4 major timings. If your talking generic pc3200 and generic pc-4000. I guess go with the generic pc4000.
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post #9 of 10
Overall speed is better for general performance than tight timings and slower speeds.
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post #10 of 10
What do you want out of a system? Do you want a fast responsive system or a great benchmark in an application like superpi?

Will you get better results in benchmark tests with PC4000 memory? Yes! Will you notice any performance increase in real world applications? Probably not. If you can keep the tight timings with a slight divider, and jack your processor up to 2.8GHz that would be awesome.

The decision is totally up to you. If I could run my processor at 2.8GHz and with a 166 memory divider with a net memory frequency result of 232Mhz I would be very satisfied. But, that is just me. If you want an excuse to order new memory, then just ignore my post.

Good luck. Any choice you make is a winner in this situation.
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