Quick Q about opteron 146 HTT settings

tom_nieto · 6 Apr 2007 at 00:36

Hi!

Having just bought 2Gb RAM which is now sitting nicely (touch wood) at DDR500 speeds, I'm having another play with my PC. At the moment I'm at 2.5Ghz, 250Mhz fsb, DDR500 (3,4,4,8).

I know my chip can do 2.8Ghz, but as 10x is my highest multiplier I'm limited to fsb clocking only and using a mem divider. Currently I've got the HTT multi at 4x giving me a round 1Ghz. If I up the chip to 2.8 and lower the HTT to 3x (3 x 280 = 840, necessary as far as I remember), what impact is this going to have on the performance? I think I'm also going to have to run my memory at 232Mhz, although of course I'm going to push for the higher 256 offered by the next divider. If it's at the lower speed I can always try to tighten up the timings.

The PC has been running Orthos for 15 mins now and seems fine. The performance is good at stock, don't get me wrong, but I can't settle for that now can I?

Thanks!

EDIT: Damn, I forgot how addictive this actually is. I've been benching fine at the above settings but I can't get the PC stable at 2.8 whether I use the 183:200 or the 166:200 divider. I've tried higher voltages, but I don't want to push my luck too much this evening. Will try again tomorrow.

w3bbo · 6 Apr 2007 at 06:52

Keep HTT as near as possible to 1000mhz, going over 1000mhz can sometimes cause stability issues but going under has little effect (if any) on performance.

str · 6 Apr 2007 at 11:30

If half multipliers are available on your motherboard you could do 323 x 8.5 with the 166 memory divider to give 2745MHz and DDR500 or 330 x 8.5 to get the 2805MHz and DDR510 should that be stable.

Download A64 MemFreq to find out other combinations that might also be suitable.

tom_nieto · 6 Apr 2007 at 11:39

Thanks! Will give that a go.

str · 6 Apr 2007 at 11:43

Also if no half multipliers you can do 9 x 305 with 166 divider for 2745MHz and DDR500.

trojan698 · 6 Apr 2007 at 12:16

The drops in HT and RAM speed will be more than cancelled out by the extra 300mhz core speed.

tom_nieto · 6 Apr 2007 at 12:49

Cool, will push for the higher CPU speed then. I couldn't get 3d mark to run properly at 2.8 for some reason last night, probably needed more juice! Might go for 2.75 and DDR500 first, as the RAM is certainly happy at these speeds.

str · 6 Apr 2007 at 13:17

I saw your other thread about the memory you bought recently. What's the default timings for your memory (2.5-3-3-7?) as you could probably just run it at DDR400 for now with it's default volts and timings until you get the CPU at the speed you want and confirmed as 100% stable and then reconfigure to get the memory running higher should it provide a decent speed boost.

Using 9 x 312 with the 133 divider will give you 2808MHz and DDR400.