Oldschool A64 question

[Modular]

I know most A64's were 1000HT Bus, but according to this Wikipedia page, my particular processor is native at 800HT. Can anyone confirm that this is correct? If I ran it at 1000 would I damage the processor?

 

[heyheybooboo]

Originally posted by: Modular
I know most A64's were 1000HT Bus, but according to this Wikipedia page, my particular processor is native at 800HT. Can anyone confirm that this is correct? If I ran it at 1000 would I damage the processor?

I think some early Opty Denmarks may have been 800MHz HTs. too.

The measure I always used (whether correct or not) - as long as your HT speed is equal to or higher than your RAM speed you are good-to-go.

 

[Elias824]

My old 3000+ and 3200+ Venice core 939's were both 1000HT, doubt that a 3400+ would be lower.

 

[MadScientist]

Unless your oc'ing and your CPU oc will take the HT over 1000, leave it at 1000. Read Zebo's Quick & Dirty A64 OC Guide.

 

[lyssword]

HT doesnt matter much Especially if only 200mhz diff

 

[Modular]

Originally posted by: MadScientist
Unless your oc'ing and your CPU oc will take the HT over 1000, leave it at 1000. Read Zebo's Quick & Dirty A64 OC Guide.

I am overclocking. I have heard that having the HT link above the design spec for the processor can cause damage. My mobo has a HT link multiplier setting, so I can pull my HT back from 1000 to 750 very easily if I need to.

The question I have then is whether running HT above spec (assuming that my processor should be at 800HT as the Wikipedia entry suggests) is causing damage to the processor or memory controller.

 

[SlitheryDee]

Originally posted by: Modular

Originally posted by: MadScientist
Unless your oc'ing and your CPU oc will take the HT over 1000, leave it at 1000. Read Zebo's Quick & Dirty A64 OC Guide.

I am overclocking. I have heard that having the HT link above the design spec for the processor can cause damage. My mobo has a HT link multiplier setting, so I can pull my HT back from 1000 to 750 very easily if I need to.

The question I have then is whether running HT above spec (assuming that my processor should be at 800HT as the Wikipedia entry suggests) is causing damage to the processor or memory controller.

I doubt 200mhz would damage anything. I would be more worried about system instability. IIRC HT has far more bandwidth than the processor will use anyway, so it shouldn't affect your performance to dial it back.

 

[SlowSpyder]

Originally posted by: lyssword
HT doesnt matter much Especially if only 200mhz diff

I never saw any hit in performance or improvement when I raised or dropped my HT multiplier. OP, I doubt you'd hurt anything by running 200x5 HT, but I don't belive you'll gain much either.

 

[Modular]

OK, thanks for the tips. System is Prime stable for 12 hours right now at 246 FSB (2706mhz). I was trying to hit a solid 250fsb, but I don't want to go over 1.55 volts on the cpu core at this point. Temps are between 53 and 55c loaded per Coretemp, so I might be able to squeeze a few more out of it, but I'm not sure what it would be worth.

This is the first system I've overclocked and that extra 500mhz sure makes this thing snappy in games; although I can only imagine what a C2D above 3ghz must feel like. The only problem was that my memory is Corsair Value, and can't quite hit that frequency, so it's at 193 Mhz due to divider restrictions.

 

[Zap]

That was an oddball OEM socket 939 chip. I think basically AMD had some chips that couldn't reliably run at higher HT bus speeds, so they sold it as a slower speed. The same chip with a 1000MHz HT was called a 3500+. BITD the OEM 3400+ were selling for real cheap on Newegg.

IIRC the performance difference was miniscule at best.

 

[RichUK]

Socket 754 was 800HTT, socket 939 was 1000HTT.

 

[Stumps]

increasing the speed of the HT bus doesn't do much...I remember having my old A64 3000+ 754 running at 2.87ghz, the HT bus used to run at 1148mhz on that setup and it ran like that for nearly 2 years with out a single problem....I'm pretty sure if I was to get the board and processor out of my storage box it would still run perfectly fine for another 2 years or more.

 

[littletemple]

I got a 3400+ and it is indeed 800HTT. I don't think making it 1000HTT would make that much of a performance difference.

 

[Zap]

Originally posted by: RichUK
Socket 754 was 800HTT, socket 939 was 1000HTT.

Generally speaking, yes. However, the socket 939 3400+ Venice core really was 800MHz.

 

[poohbear]

Originally posted by: lyssword
HT doesnt matter much Especially if only 200mhz diff

QFT

HT doesnt matter at all for the A64. I ran mine @ 700mhz from its native 1000mhz and it made no diff.