Opteron 148 at 1.5 Volts -- any danger?

[mordantmonkey]

Originally posted by: Goldenstyx


for those of yall believes it is ok to get a cheap value ram pair with opty and do a 50%+ oc and still prime stable... well its your choice

while it's true that with A64's memory controller system it doesnt really matter how you get there (your 3G+ oc), as long as you get to there, but i will never even consider for doing massive oc with value ram... it just like running a FX60, 2 7800GTX 300G RAID $300case 4G ram system with nonname 10 bucks power supply.

well if your gonna be running a 146 at 3.0 then you'll either need a divider or your ram will have ddr4800. of course to run at that speed you'd have much worse latencies than even value ram at more than twice the cost. and the latencies will erase about half of that memory overclock. just look at all of the benchmarks out there. For the price difference you would do much better to buy a better video card, or faster processor that will OC even more.
yes, in candyland where money grows on trees and everyone has an fx-60 and 2x7800gt's then i'd say sure. go buy the fastest most expensive ram you can.

and considering a PSU is far more vital to the system (esp. overclocking) than value/expensiveRAM, i'd say no, it's nothing like running on a $10 PSU.

 

[Absolute0]

Originally posted by: Rustler
My CABYE 0540 does 2914Mhz on 1.39 volts in my ASUS rig!

Hey my CAB2E did 2.95 with 1.4v on the stock heatsink

Anyway 1.5v is nothing to be afraid of! I'm running 1.5 volts on the stock heatsink now with 54C load temps. Good way to burn in

 

[WhipperSnapper]

Originally posted by: CP5670
Try using a lower multiplier. I ran into a similar wall on mine (a CABYE 0540FPAW) around 10x285, which isn't completely stable even at 1.55V, but it does 9x333 and 8x375 without any problems at 1.52V. It seems some CPUs can go further on a lower multiplier than with their highest one for some reason.

The memory will make no difference in the maximum CPU speed as long as it's running on a divider.

Interesting suggestion. I thought that the only thing the multiplier really did was to tell the motherboard to run the processor at a higher speed. So it's more than just that?

Of course, I'm using a memory divider, so the memory isn't really an issue.

The other thing I wonder about is whether my motherboard might be having trouble going over FSB 250. It's the Epox EP-9NPA+Ultra. Should I consider increasing the chipset voltage and seeing what happens? Are there any negative repurcussions to increasing the chipset voltage? I take it that it's similar to increasing the voltage for the CPU? How common is it for people to have to increase the motherboard's voltage?

 

[fighterpilot]

Originally posted by: WhipperSnapper

Interesting suggestion. I thought that the only thing the multiplier really did was to tell the motherboard to run the processor at a higher speed. So it's more than just that?

Of course, I'm using a memory divider, so the memory isn't really an issue.

The other thing I wonder about is whether my motherboard might be having trouble going over FSB 250. It's the Epox EP-9NPA+Ultra. Should I consider increasing the chipset voltage and seeing what happens? Are there any negative repurcussions to increasing the chipset voltage? I take it that it's similar to increasing the voltage for the CPU? How common is it for people to have to increase the motherboard's voltage?

Usually you just lower your HTT multiplier to 4x. My mobo won't go a whole lot over 200MHz, so I do 4x245 = 980 HTT, which as I understand it, is a peak value for data transport, and it rarely if ever reaches that peak. Shouldn't affect overall performance however.

I've been able to run stable:

Opteron 175 @ 2.7 GHz 1.55vCore
FSB 245MHz
OCZ Platinum @ 166 divider for 192MHz effective
HTT 4x

Strange thing is that I had it running stable at 2.6GHz with 1.475 vCore with Prime95 but it choked with 3DMark05.

I had to bump vCore all the way up to 1.525 to get it to work properly, but when running at 1.55 it is completely stable at 2.7GHz

 

[WhipperSnapper]

My HTT multiplier is currently 4x (4 x 250). Even with it at 3x, I still need more voltage to get much beyond 11 x 250.

 

[fighterpilot]

Originally posted by: WhipperSnapper

My HTT multiplier is currently 4x (4 x 250). Even with it at 3x, I still need more voltage to get much beyond 11 x 250.

That seems odd, because obviously you are well below the 1000MHz "cap" for the hypertransport. 3x250 = 750MHz. I don't quite understand.

Also consider the fact that even if you're running 166Mhz divider (0.83) at 250MHz, your memory may be pooping out on you if it's not the best memory and can't run much beyond the 200MHz. Try loosening your RAM's timings or increasing its voltage and see what happens. Or reduce the divider to 133 just to see if its the problem.

 

[trOl]

Here's my 148's 24/7 stable setup:

148 CABYE 0543FPMW
264x11, HT x4
core 1.565V (1.525V +40mV)
HTV 1.25V
nF4 1.65V

idle: ~32'c
load: ~44'c

Idle temp is ~32'c and load is ~44'c. I have mediocre winbond CH-6 ram so I'm running the ram at cpu/14 but I'm able to get 2.0-3-3-6 1T up to ~225 on the ram. I'm able to run HT *4 up to about ~280.

I can run 2860 at 1.475V but I really wanted a ~33% overclock, so +0.1V it is.

ps: I just switched cool'n'quiet on today after burning in for a week and I'm amazed, it's rock solid stable, works like a champ and gives excellent temp reduction on air. I figure the extra heat dump & power consumption isn't worth it when the machine is idle.

The sweet spot on this processor is right at 2.86ghz, I can run 2.86 24/7 stable with 1.475 vcore, above 260fsb I really need to jack the voltage to keep things stable. I'd love to watercool & find out what I can do with lower temps and more volts but that's not feasible for a while.