BlackOps/Avenger: GTL Ref Table

[negev]

Could someone explain to the clueless person what this means?

I'm guessing those are voltage adjustments, does that mean that VTT GTL +31 means an extra 0.740v?

[TheGanG]

Actually hate +/-1,2,3 stuff... Now that new values are comparable with other mobos' GTL Ref. voltages, Thanks...

New BIOS Update on these days?

[Xello]

Could someone explain to the clueless person what this means?

I'm guessing those are voltage adjustments, does that mean that VTT GTL +31 means an extra 0.740v?

You're not actually changing any voltages with the gtl setting, it's a reference value that the motherboard uses to determine if a signal is 'high' or 'low' (1 or 0).

[negev]

I'm guessing you need an oscilloscope to actually work this out properly..

[Xello]

Well i tested out GTL refs with this board extensively for my QX9650 (see other thread for results) and the one thing i learned is just to go with what everyone else is using (+10, +5, +10, +10 for the 9650), as after 2 weeks or so of testing this is what i ended up on, and the instability i was having i narrowed down to other settings.

The NB GTL is a different story though, may take experimentation.

When i asked Raja from Anandtech about possible variations of the cpu gtl's he said this:

"The GTL adjustments I typed out to you [+10 +5 +10 +10] are representative of close to ~67% of VTT. Which is pretty much what the 45nm QX9650's prefer as a rule. The scale adjustments on the black ops seem to fall around the 15mv range, so anything away from these values is unlikely to be a whole lot better for most people. While there is variance in substrates across batches, it's unlikely that the variance is so large that GTL's on 2 same model processors should be out by more than 1%. "

[negev]

Yeah I am currently using 10-5-10-10 on my Q9450 and it's stable at 3.33, haven't pushed any higher with this new ram yet. Is what you said likely to also apply to the whole 45nm product range? AFAIK 9450 and 9650 are basically the same just binned differently and one has an unlocked multiplier no?

[Xello]

Yeah I am currently using 10-5-10-10 on my Q9450 and it's stable at 3.33, haven't pushed any higher with this new ram yet. Is what you said likely to also apply to the whole 45nm product range? AFAIK 9450 and 9650 are basically the same just binned differently and one has an unlocked multiplier no?

Should be, yup, as it's the process that determines the GTL ranges (and dual/quad)

[saaya]

I'm guessing you need an oscilloscope to actually work this out properly..

no you can meassure it with a DMM actually
you dont actually change a voltage as in a supply voltage, but there is a GTL voltage which is used as reference to check if a signal on the fsb should be interpreted as a 0 or a 1, and this ref voltage can be meassured.

Ill check where the measuring spots are on different boards and will check how accurate the bios settings are.

so do you guys want the actual reference voltage as a setting or do you prefer the 0.67x vtt setting that asus and others are using?

as for what gtl setting works best, i think even among 9650s theres a difference from cpu to cpu, intel reworked their 45nm process a couple of times and there should be a difference between c0 and c1 stepping as well... but yeah, the settings raja recommends should work well for most 9650s or be close to the best setting

if your reading this, thanks again for the good work raja