Running with a high HTT and stability.

dagwoood

dagwoood

dagwoood

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If you set your HT multiplier correctly, can running with a high HTT in of itself cause stability issues?

I ask as I realised that if I lower my CPU multiplier to x8, increase the HTT to 337 and run on a memory divider of 133, I can run at 2.7GHz(which I'm near to proving is my max stable speed)but increase my memory speed from 192MHz to 225MHz.

Any advice would be welcome as I don't want to start another round of stability tests, only to be baulked by stability issues bought on by having a high HTT.

I don't know whether the CPU and brand of motherboard have an affect on this but I have an Opteron 144 and an EPoX EP-9NDA3I motherboard.

Cheers, dagwoood.

P.S. I realise if I set my HT multiplier to x3 and set the HTT to 337 I'd be running the Hypertransport slightly over spec, but I presume this wouldn't cause any problems.
 
It depends on the board. My KN8 is happy at 333HTT but gets dodgy at about 360HTT. I wouldn't worry about running the hypertransport link over spec as mine will run without problem at 4*300.
 
Gribs said:
It depends on the board. My KN8 is happy at 333HTT but gets dodgy at about 360HTT. I wouldn't worry about running the hypertransport link over spec as mine will run without problem at 4*300.
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Sorry for the hijack, but HOW? My KN8 doesn't seem very keen above 322?! Whats your secret? Sorry for the hijack, but this is the first KN8 owner I've come across :)
 
I don't really know as it's just worked. The voltages are 1.46V for the processor, the rams at 2.7V, all the rest are standard. I'm using the 266ddr option for my ram so it's running at 215mhz. The htt multiplier is currently set to 3 though I was using it at 4 below 300htt. This is on the bios from November.

I dropped the mulitplier on my opteron to 4 and it'd post up to 375 but wasn't stable. This was with stock voltages apart from the ram which was at 2.7V
 
Whats your opty code mate? I have a cacje? I don't think however my board will boot at that fsb full stop. Do you have to change anything bar HTT to get to that? (obviously memory speed to keep it around the 200 for 3200)
 
I don't know the codes off hand. Is there a program that'll display the info? I'm basically using bios defaults other than voltage and memory settings. I've also got the floppy controller turned off.
 
I just set the ram to ddr266 and set the cas latency to 2.5, all other settings are defaults from the ram. It's sort of stable in that it'll run everything I want without crashing but it'll only prime for a couple of hours. With the voltage increased to 1.52V it'll run prime95 fine for over 24 hours
 
You'll need some stability testing guaranteed. Your board uses an nF3 chipset - one which is known to top out at about 280-290mhz - anything beyond is unstable. The nF4 chipsets clock much further than nF3. Run a long prime, I shouldn't imagine it'd last too long.
 
smids said:
You'll need some stability testing guaranteed. Your board uses an nF3 chipset - one which is known to top out at about 280-290mhz - anything beyond is unstable. The nF4 chipsets clock much further than nF3. Run a long prime, I shouldn't imagine it'd last too long.
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Thanks for that smids. The nF3 issue would explain my current problem http://forums.overclockers.co.uk/showthread.php?t=17566130

I purchased the EPoX board to replace an Asrock Dual Sata so as I could get my HTT above 274 and it's now looking like I've wasted 50 quid :(
 
dagwoood said:
Thanks for that smids. The nF3 issue would explain my current problem http://forums.overclockers.co.uk/showthread.php?t=17566130

I purchased the EPoX board to replace an Asrock Dual Sata so as I could get my HTT above 274 and it's now looking like I've wasted 50 quid :(
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Sorry to hear that :(. Still, at least you can stop trying to work out the cause of your problems :).
 
smids said:
Sorry to hear that :(. Still, at least you can stop trying to work out the cause of your problems :).
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Thanks for sharing my misery and trying to find the bright side :)

It makes more sense now why I have to put 1.50v through my CPU to get it stable with an HTT of 300, but with an HTT of 294 it was stable with 1.45v. It looks like the extra 0.05v is to combat the instability of such a high HTT.
 
The Dual SATA2 is a good board and has lots of features above the nF3 so I'd certainly say do that. I'm sure someone can help you out on the settings too if you head into the motherboard section. Good luck :).

And in answer to your HTT question about 300mhz vs 294mhz - I don't think that was the HTT causing that - it sounds more like the memory controller. It would seem that if you managed to get 300mhz stable, then the chipset CAN handle 300mhz (rare but doable on the nF3) but I doubt it'd go much further than that.
 
dagwoood said:
I'm in a quandary now. I don't know whether to put my Dual Sata back in and see if the OC beta bios will take(the other betas wouldn't "remember" my settings).
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What is this bios you talk of for the asrock board? I take it that its unofficial? Do tell where can you get it from?
 
Gribs said:
I just set the ram to ddr266 and set the cas latency to 2.5, all other settings are defaults from the ram. It's sort of stable in that it'll run everything I want without crashing but it'll only prime for a couple of hours. With the voltage increased to 1.52V it'll run prime95 fine for over 24 hours
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What bios are you running mate?
 
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