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post #17341 of 28692
Ciff, just so you don't get confused HTT is the reference clock speed or fsb. HT is the Hypertransport speed (ie. 855Mhz).

Just that I'd throw that in there, I didn't want you getting confused

Good luck
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post #17342 of 28692
Quote:
Originally Posted by ciff1 View Post
had memory on 2/3 but got to 270fsb x 10 ram at 180.1 but would not boot so lowered to 100 1/2 booted first time. Will take advice and try 8 x multi. timings at 3,3 2,8.
Try 3-3-3-8 timings,they might prove to be a bit more stable.

ALL: I've often wondered why max out the LDT voltage? I have yet needed a reason to do so. Even with my one Ultra-D that can hit 400 reference clock.
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post #17343 of 28692
I've left my LDT voltage at stock. Whenever I try and raise it Prime95 still returns errors, so I haven't seen a need to raise it thus far. I've been bumping NB (both 1.8 and 1.2) voltages and vcore up like crazy, though...
Edited by decimator - 7/23/09 at 4:20pm
post #17344 of 28692
Upping NB is only required (in my experience) with high reference clocks. On my Asus (A8N32dlx), I had to increase ~272 ref. clock, with my DFI's I can take them well over 300 before any voltage increase is required. Hell, on one of my ultra-d's it only needed 1 voltage bump to achieve 400 ref clock.
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post #17345 of 28692
Quote:
Originally Posted by BlackOmega View Post
Try 3-3-3-8 timings,they might prove to be a bit more stable.

ALL: I've often wondered why max out the LDT voltage? I have yet needed a reason to do so. Even with my one Ultra-D that can hit 400 reference clock.
That's cause there's tons of sites that always say "Then I even maxed the volts" in their OC reviews.

before the days of active cooling I used to swap out the cystal and lower the voltage to run cooler.
post #17346 of 28692
Quote:
Originally Posted by Hueristic View Post
EPIC WIN! (+REP)

I thought the rules for tRFC on DDR2 were different than those on DDR. This is why I might have been having some instability issues with my RAM. Great find, thanks.
     
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post #17347 of 28692
Quote:
Originally Posted by Hueristic View Post
That's cause there's tons of sites that always say "Then I even maxed the volts" in their OC reviews.

before the days of active cooling I used to swap out the cystal and lower the voltage to run cooler.
Wow, I get to quote myself! I shouldn't post at night while my sleep meds are kicking in.

So BO looks like I misread your Comment on the LDT voltage. I was unaware that DFI boards have this option (thought you were just talking Vcore: Too many new fangled acronyms for me to keep up with/ageoff). So I did some digging (Yeah googled ) and It looks to me like DFI decided that some chips were suffering from a vdrop in HTT voltage when OCing. And as a result decided to give the option to raise the LDT(HT die portion voltage?) for better stability rather than bumping the entire chips Vcore (Is this on all DFI's or just the Specialty ones). This sounds pretty good if it can be done (I really don't know how the K8's get their voltage to which portion of the die) But it would seem to me that if your OC was unstable then you should try raising your LDT (first) rather than your Vcore. That should in theory provide stability for a higher HTT without the excess heat of raising the entire core. Now I'm just making a guess here but from reading a few posts by others this looks to be a possibility.


OK, was not happy with not knowing what this setting was so did some actual searching (googled and checked more than 2 links) and it seems that LDT ( lightning data transfer) is just the old way of refering to HTT.
Quote:
An interconnection standard introduced by AMD that allows for fast data transfers among the Northbridge part of a chipset, the PCI bus(es), and the Southbridge part. In a multiprocessing machine the LDT bus can transfer data between sets of two processors. AMD now calls this technology HyperTransport.
So according to this the LDT setting will increase the voltage on the NB that control's the data lines to the southbridge). Still seems like a good idea to bump it when you hit a wall on your HTT and then lower it again if it doesn't provide stability. So did DFI just never rename this setting in their bios? Or do they keep it named that so as to differentiate between the base NB Vcore and the HTT bus controller? Now I'm starting to think I might look into a DFI in the future (I've been pissed at them since their PII boards didn't have voltage detection circuitry and blew up a CPU on me (was a Kalmath board only ).

Quote:
edit: did some testing with a different CPU(venice 3200+). same results. LDT at 1.2 = 2913 in 3dmark05. LDT at 1.5 = 3250. Unbelievable.
------------
no i was turning voltages down to reduce heat. to find out what voltages my system was stable at. well i notice for a while my 01 scores were down and my framerate was down in certain games. this bugged me for a while. well i went back in and turne voltage back up on ldt and bam my scores are back
OK after re-reading this mess I'm not happy with it. I'n no expert on 939's to begin with and Have no working knowledge of the DFI's in particular so would one of you DFI/939 Guru's do a better job of explaining this: I'm really inteseted in finding out where this voltage is applied (I think it's on the CPU mem controller)



:moved after edit:
Forgot why I posted this. LOL, might have to do with another conversation going on.

Also in the old days before Pentium/K5 (IIRC, Hmm I think the original Pentium 66mhz was 5v <yeah it ran soo hot that's when the voltages started to drop>) cpu's were 5v and by extension Overvolted and HOT as well as not sinked or active cooled. Actually it was felt that needing external cooling was a sign of a bad batch. Only Top of the line Mini's and above were cooled. I think the first desktop CPU I ever saw with a HS was a 386sx16mhz (times they be a changeing).



Quote:
Originally Posted by blitz6804 View Post
EPIC WIN! (+REP)

I thought the rules for tRFC on DDR2 were different than those on DDR. This is why I might have been having some instability issues with my RAM. Great find, thanks.
NP man It was news to me (been fighting with some Crucial ballistics:looks like I have a notoriously bad batch number) and thought you guys would find it useful.
Edited by Hueristic - 7/24/09 at 7:10am
post #17348 of 28692
Unfortunately, even tweaking that setting I cannot get my RAM to work any better... apparently, GSkill does not give you a 5% overclocking headroom but instead, a scant 1.5%. I will need to lower my divider to increase my CPU, but see below.

I was under the impression that "LDT Voltage" was the hyper transport voltage, not the HTT voltage. I could be wrong however.

Question for all: if my PC boots and is stable with one RAM divider, will not post with the next divider slower, and is stable again with the divider below that, could that be indicative of bad RAM? All other settings other than the divider are static.
     
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post #17349 of 28692
Hueristic, I think most of the Lanparty series/model mobo's are geared more towards enthusiast's & overclocking, while other DFI series mobo's like the Infinity series is more geared towards budget builds w/less features and cheaper hardware. I don't know a whole lot about the LDT voltage. I guess I never got that involved in my overclocks. Plus I was always to scared to start upping the voltages on settings I don't understand.
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post #17350 of 28692
Quote:
Originally Posted by blitz6804 View Post
I was under the impression that "LDT Voltage" was the hyper transport voltage, not the HTT voltage. I could be wrong however.
Blitz, yeah you're correct about the LDT (Lightning Data Transfer or Hypertransport) Voltage. It's a separate voltage control from the reference clock speed.

Quote:
Originally Posted by blitz6804 View Post
Question for all: if my PC boots and is stable with one RAM divider, will not post with the next divider slower, and is stable again with the divider below that, could that be indicative of bad RAM? All other settings other than the divider are static.
Good question, that is definitely a weird one. What kind of IC's came with this set? Perhaps the memory doesn't like that "next slower divider"? Strange...

Good luck
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