Overclock.net banner

First time OCing.. Opteron 148

383 Views 8 Replies 5 Participants Last post by  daweinah
Ok.. so I've been doing a lot of reading and have managed some nice (imo) results, but now I'm starting to worry/wonder about what my limits are and what happens if I hit them. And now I also need answers to a bunch of questions that have come up lol

Here's the clock specs:

Part: Stock / OC
CPU: 2200 / 2625
Mult: 200x11 / 250x10.5
HTT: 5x / 4x
GPU: 470/1100 / 490/1200
RAM: 2-3-3-8 / 3-4-4-9

That's all I can think of that got changed. Haven't missed with voltage at all. EVEREST says the CPU temp is 32 deg with current setup.

Now for the good part...

-With the increase vid card clocks, ATItool finds artifacts, but I don't notice any while gaming - should I lower the clock to make ATItool happy, or leave it since I can't tell? I don't want to endanger my card.

-What is the memory divider thing, is that where I set how fast I want the RAM to run? (DDR400, DDR433, etc)

-When you set the HTT to 3x, and have the FSB at something like 270, does it hurt performance because you're so far away from 1000?

-The FSB is supposed to match the RAM clock right? I have DDR400, so what happens when I go over 200?

-Why did my RAM timings go down the toilet?
I just noticed that Everest says my Memory Bus is 238.6MHz and lists my ram as DDR477.. is this the max speed the ram can go, since its trying to catch up to the 250 FSB? Should I drop the FSB to 238 and increase the mult to 11?

-Under Chipset Properties, it shows the Memory Timings at 3-4-4-9, but under SPD Memory Modules, it shows 3-3-3-8 @ 200Mhz; why is it different?

-Everest says "DRAM:FSB Ratio: CPU/11" What does that mean?

That'll do it for now, I'm sure I'll be editing soon lol. Thanks for any and all help!
1 - 4 of 4 Posts

· Registered
5 Posts
Discussion Starter · #4 ·
Where did I see what one, kitt?

Thanks Mang, how do I check my card temps?

I also just experienced my first instance of noticable problems OCing the vid card, I had it at 500/1250 and during the first test of 3DMark05 the screen had a bunch of red patches of lines, and the desktop had red and blue dots spaced out in squares.

What order should I OC the 3 parts (cpu, gpu, ram) in? How do I know when to stop OCing a certain part? ie how can I find my limits, and are the speeds of all the parts interdependent on each other? Or is this the sadistic fun of OCing? /evilgrin

Now that I have my FSB at 250, is it advisable to raise it higher? Doing so would drop.. uh, whatever FSB*HTT is called, to 800 something.

Lastly, I upped the proc to 250x11 (=2750) and it is running 3DMark05 just fine at the moment. I'm thinking this is where I should stop with the CPU and move on to the sweetspot on the GPU, and then try and tighten the RAM timings?

EDIT: Oh, and with the memory divider, why do people suggest changing it to low speeds?

· Registered
5 Posts
Discussion Starter · #6 ·

Originally Posted by z_one

Your have DDR ram (Double Data Rate) which means your ram transmits datal on both edges of the signal. So if your ram speed is 400 MHz it means it's originally working at 400/2 = 200 MHz.
When you go over 200 MHz you are exceeding your ram's capacities.

So I'm definitely over 200 MHz, are there any warning signs I should watch out for, or a way to test the RAM's capability to handle a 250MHz FSB?


Originally Posted by z_one

As I said before you have DDR ram so when the original speed is 238.6 MHz it means your ram is transmitting data at 238.6 MHz x 2 - 477.2 MHz (thus the numbers you see above).

If the original speed is DDR477, why was it manufacture rated DDR400? And why are my stock timings so much looser than they are supposed to be?


Originally Posted by z_one

While on Intel based systems it's always best to have FSB speed match RAM speed (FSB:RAM = 1:1) this is not entirely true on AMD based systems.
On AMD systems it's better to keep your ram running on tight timings even if that means you have to set a divider because ram cannot keep up with the ever increasing FSB speed.

Should I reset the CPU and GPU back to stock speeds, set the ram to DDR400 1T/2-3-3-6 like its rated for, and start OCing the CPU and GPU from there? What happens when the computer doesn't like the settings I put?


Originally Posted by z_one

I assume it's because you took your ram higher than 200 MHz and thus it had to relax the timings to be able to run at higher clock speeds.
Try upping the voltage supplied to your ram modules a notch and see if you can run them at 3-3-3-8 with speeds such as 240 MHz.

I was thinking the same thing, since the speed was set to Auto.
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.