a64's--why run a lower multi than max?

[rise]

why run a lower than max multi?

 

[Doctorweir]

To max out the memory and get HTT closer to 1000 again when the processor won't make it further...

 

[AristoV300]

^^^ higher memory bandwith.

 

[rise]

i have to run a divider as is, 230x10 ram .90 (183/200HT).

maybe i'm not understanding something. i have fsb freq, LDT/fsb freq, and cpu/fsb freq ratio (multi). when i raise the fsb it raises the ram too. then i have the LDT freq, which is either 5x, 4x, 3x, 2.5x, 2x, 1.5x, 1x. if i run LDT at 4x is that again oc'ing the ram?

3200+
1 gig pc3500
nf4 sli-dr

whenever i try to run over 2x LDT i end up re-installing my 6800gt. the system just freezes in any 3d application. its stable in prime, pi and memtest but just kicks me back, regardless of the volts i put on the LDT,vid or memory. i'm confused somewhere i guess.

edit--looking at your sig doctorweir, you're running a .83 divider?

 

[Doctorweir]

In my case it is 250 "FSB" with a 4x HT-multiplier (=1000HTT), the mem is divided (FSB/1.2), which gives me the tightest timings at ~208MHz memory frequency (due to my memory not being capable of 250 1:1 with relaxed timings or an issue of the A8N, respectively)...

With your 230 FSB you should also run the 4x HT-multi (=920) and due to your ram being DDR433 (?), you should be able to run it either 1:1 with a little relaxed timings or at DDR400 values which gives the divider you use currently (i presume)

Wondering, that your HT-multi affects your graphics board...should run stable as long as under 1000
The HT-multi does not affect the ram, as the ram is directly connected to the processor and the HT-multi defines the connection speed from processor to northbridge...

 

[rise]

so the HT (or LDT) multi affects what? i found this over at dfi.street and it kind of helps but i still don't really understand what it is for and why changing it would afffect my system in any way, so long as like you noted, i keep it not more than ~1000.

so, if it affects the communication between the processor and the NB, doesn't the NB handle graphics and Ram?

 

[Insomniak]

Originally posted by: rise4310
so the HT (or LDT) multi affects what? i found this over at dfi.street and it kind of helps but i still don't really understand what it is for and why changing it would afffect my system in any way, so long as like you noted, i keep it not more than ~1000.

so, if it affects the communication between the processor and the NB, doesn't the NB handle graphics and Ram?

HTT total speed needs to stay at 1000 or less or NF4 becomes unstable. Just use the HTT multi to keep things at that level and you'll be ok. There's really no performance difference between 3x and 5x HTT anyway, so other than keeping it stable, there's no difference. Just adjust as needed to get your desired OC.

 

[rise]

yes, it's just odd that i can't even do 3x which should be well in the less than ~1000 point. itjust leads me to believe i'm doing something wrong.

 

[Elfear]

DFI boards are a little tricky since they have so many timing options on them. If I were you, I'd spend a lot of time on xtremesystems.org and dfi-street.com to see what timings they are using. Those guys have put a lot of time and effort into making their DFI boards perform very well.

 

[rise]

thanks guys. yes, dfi street is my new best friend

unfortunately, they seem to speak as if everyone has owned an amd and a dfi board all their lives lol.

anyway, i'm up at 2350 with a 1.5x HTT i just want to understand it better. i also mispoke a bit on the HTT multi at 3 and above, what it did the last few times was boot to windows but the 6800gt wouldn't start so i had to do re-installs to get the system to recognize it.

it's super pi, 3dmark and prime95 stable at my current 1.5 HTT and as mentioned, i don't get why the HTT would affect the VGA.

 

[superkdogg]

Originally posted by: rise4310
yes, it's just odd that i can't even do 3x which should be well in the less than ~1000 point. itjust leads me to believe i'm doing something wrong.

HTT has a relationship to VGA because it's how much bandwidth there is between the northbridge and the card IIRC. I wouldn't worry about it at all as long as you've got a stable system. Mine is @ 2x and there is little->no performance difference between any of them as far as I know (1x may be slower-never tried it).

 

[rise]

thank you again, my benches look ok-- 11,430 in 3dmark03 with an @ stock 6800gt and she's still stable-

235x10 with a 1.5HTT, ram @ 212 2.5-4-3-7-12
vid 1.42, LDT 1.26, chipset 1.48, dram 2.9

now i gotta go back and see if the max's i got drom Zebo's method are correct. it is a bad week from what i hear, ccbid 0508 i think it was. isolating the cpu failed it at 250 but i'm not sure i had the vid right as this board seems to have a bug with ccbid.