amd 3500+ winnie

[ayman]

Okay to start off i'm new to overclocking and i understand very much the basic concept and how things kinda work. This is the thing, i don't exactly want to OC yet since its brand new and i wanna break this cpu in, but what i do wanna do is set my ram to run at higher speeds.

As of now i have 2x512OCZ Gold Edition Rev.2 running at stock timings which is 2.5-3-3-8. This ram is PC-4000 DDR500 and right now its only running at 200fsb. My cpu is also running at 200fsb with a total system front side bus of 1000fsb (200x11). I want to run my ram at a higher speed. I was thinking if i could set my cpu ratio to 9x250 which is about 2250, i could then run my ram at 250 which is 1:1 and should result for best performance, right? Please correct me if i'm missing something here because again, I am new to this.

Anyways i tried to run these settings right off the bat and basically it didnt work. Made me revert my settings back to something that was stable. So my question is, what is the best way to get the best outta my memory and cpu without having to oc the cpu at this point.

Specs: MSI Neo2 Plat with zalman 7000B, AMD64 3500+ 90nm winnie, 1GB OCZ pc-4000, BFG 6800GT OC.

Thanks in advance,
Ayman

 

[SrGuapo]

you could lower your multiplier to 9 or 10 then Oc the HTT until the total clock speed =m 2.2 GHz again. If you are runnng 1:1, this would OC you RAM and HTT, but not the CPU.

 

[ayman]

so what part does the HTT come into play really? like i said before this is new to me so i'll have to understand a few more things... only thing i can make out of HTT is that its running at 5x right now and 5x200 is 1000fsb which is what i'm running. but how does this all intertwine... can u give me a quick idea of how it all fits together

THanks MUCH,
Ayman

 

[ts3433]

I'd keep your multiplier where it is and just increase the HTT frequency from there, because memory bandwidth doesn't matter much on the A64. Whenever you hit walls with overclocking the HTT frequency, lower the HT multiplier (sometimes "LDT")--this is different from the CPU multiplier--from 5x to 4x, and then 4x to 3x when necessary, etc. You don't want the total HT frequency to go far over 1000, but don't be worried if it ends up as something like 800; the HT frequency was shown to make little performance difference back in the old A64 days with the NF3 150 and VIA K8T800 (non-Pro). The NF3 150 had a slightly crippled 600MHz HT interface, but this didn't really affect performance much compared to the 800MHz HT K8T800.

 

[ayman]

okay wtf is up with tthe unreasonably high views....

 

[ts3433]

<OT>

Originally posted by: ayman
okay wtf is up with tthe unreasonably high views....

That is kind of funny, having 1,000+ views for a question like this...

</OT>

Anyway, I hope the above information helps somewhat.

 

[ayman]

well you see, the only aspect of this i understand so far is that right now i'm running 5xHTT and 200FSB with a 11x Multiplier. I understand (mutiplier)*(fsb) = clock cycle speed. I also understand that when yoiu take 5xHTT*200fsb you get 1000 totaly system FSB. What i can't seem to get a hold of is how they all are connected. So say for example i put my multiplier at 9x like Guapo said and my fsb stays at 200. This means i'm running a 1.8ghz. At this point where does the HTT come into play, how does that contribute to the total system performance to get it at the 2.2 speed again. You kinda get what i'm asking? I'm still a bit shady on this as of now.

I understand it might frustrate you guys that i dont quite get it but it just didnt click yet, i need to think about it in a clearer fashion. Please help

- Ayman

 

[ts3433]

OK....

CPU speed = Multiplier * HTT (this is an A64, which has no FSB)
HT speed = HT multiplier * HTT

If you run 11 * 200 you have 2200 MHz. The HyperTransport bus is at 5 * 200 = 1000 MHz.

Now, suppose you drop to a multiplier of 9 and change nothing else.
9 * 200 = 1800 MHz
5 * 200 = HT still at 1000 MHz.

To get 2.2GHz with a CPU multiplier of 9 (you don't need to lower the multiplier on an A64, since memory bandwidth means little), you need to raise the HTT.
2200 / 9 = HTT of ~245 MHz
5 * 245 = HT of 1225 MHz. This is problematic and way out of spec, as HT only up to 1000 MHz is supported. Lower this multiplier.

4 * 245 = HT of 980 MHz. That's better. Remember, though, that as long as this frequency is somewhere between 600 and 1000 total (try for as high as possible, though), you shouldn't see wild adverse performance differences.

 

[ayman]

there we go, now i get it.... thank you very much ts3433, always helpful.

Appreciate it, now i get an idea of how it all works. spanks

- Ayman


But like you said, since amd has its own memory controller it wont even matter if i run the ram at 250mhz correct? This would probably impact an intel processor though.

 

[ts3433]

Originally posted by: ayman
there we go, now i get it.... thank you very much ts3433, always helpful.

You're welcome. As you can tell, I don't get out much on Friday nights At least not until the law allows me to drive, anyway (that'll be in two years)...

But like you said, since amd has its own memory controller it wont even matter if i run the ram at 250mhz correct? This would probably impact an intel though.

I direct you here (this thread is also stickied at the top of the forum). There is a slight difference in most applications that favors 1:1 RAM or 5:6 RAM at low latencies, but it's nothing you'll notice.

Not running 1:1 or at least 5:6 (if you're at really high FSB frequencies) will often be a big detriment to Intel performance. On the AXP, you also want to run 1:1, but value RAM is fine here as well, since typically you don't raise your FSB higher than 200 when overclocking an AXP (you usually fiddle with the multipliers or settle for the standard 2.2GHz overclock if you have a locked chip). Value RAM can usually handle 210-220.

 

[ayman]

yeah i've read that thread enough times lol... as well as the overclocking guide... both very good stickies