Originally Posted by Hueristic
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.
|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
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)
|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
: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).
Originally Posted by blitz6804
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