Opteron 165 Memory Controller

[Xander_Hal]

Hey all,

I recently upgraded from a Venice 3500+ to a Toledo Opteron 165. I just wanted to share some info on RAM overclocking on my EPoX 9npa+ Ultra.

I used to run my Venice @ 2.5 GHz, 250 x 10 with a 183/200 memory divider. My max memory speed definitely was around 230, and I had a lot of problems trying to get it stable past that; lots of BSOD's etc, even with tweaking the timings.

This morning I made my first overclock on the 165; 255 x 9 to 2.29 GHz. I'm a few hours in and it's perfectly stable. To my great surprise, I just noticed that I'm running without a memory divider, so the RAM is pushing just past DDR500 speeds @ 255 MHz!

Keep in mind that these are pretty good quality DIMMS, Corsair XMS 3200 XL, but I'm running 4 x 512 @ 2t which is not necessarily the most stable setup. Timings are 3-3-3-6 @2t. I'm sure people have pushed further, but I'm mostly interested in the apparent difference between the two processors!

Cheers,

-Xander

[skool h8r]

Hi Xander,
i've got my 3200+ Venice running at 2.6Ghz (260x10) with no ram divider on the EP-9NPAJ-SLI meaning that my memory was running at DDR520. I'm using Corsair XMS 3200C2PT at 3-4-4-9-2T. Try and push that Opty further, i'm sure you can get better than that. See if you can get 2.4. Then go on to 2.5, the 2.6, etc. What's the max multi on that beast? Try setting it to 10 at least if you can so that it makes the maths easier and you can be sure your memory is running at the speed that the CPU Freq. is.

HTH,
Scott.

[cadaveca]

might simply be timings in bios for the single core that was holding you back before. XMS 3200XL is based on tccd, and should go upwards of 300mhz, given the proper settings Try 2.5-3-3-6 for 250mhz.

[Xander_Hal]

The max multi on the opteron 165 is 9x, which is why a lot of people go for the 170 which is 10x. I don't think the 9x will hold me back that much, since my goal is 2.6. I'm going to overclock in steps I think, doing some gaming and priming in between and trying to keep the vcore down.

Cadaveca, 300 Mhz?! That's obscene! At least I know I can try to push this CPU up high and the RAM should be able to keep up with it!

[cadaveca]

you should at least get 275, 3-4-4-8. pc 4800 stuff is the same IC, TCCD. TCCD is not like TCC5....it's much better. The real good sticks will do that 300mhz @ 2.5-3-3-6 too. I'd love to play with your ram

[gedon]

- one slow spinning 120mm fan or two 6mm fans in front of the ram
- voltage between 2.65V and 2.85V
- timings of 2.5-4-3-6 or 2.5-4-4-10; Max Async Lateny 8; Read Preamble 5

this way I got my two sticks to 295MHz and my Opti to 295MHzx9