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post #17351 of 28692
Thread Starter 
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.
This is correct. LDT Voltage (HT Voltage) overvolts supposedly improve the motherboard/chipset's ability to run at higher than default speeds (i.e., higher than 1000MHz/2000MHz double-pumped). On my ASUS A8N32-SLI Deluxe, where I run the HT bus at 1160MHz (290MHz x 4), I did not enable HT Overvolt (not that the BIOS supports granular voltage overvoltage control like DFI BIOSes do) to keep the system stable.

I would imagine each board to react in its own individual manner, so if you choose to run at higher-than-stock speeds on the HT bus you have to test the effects of LDT/HT overvolts.

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.
I've seen this happen with lots of boards, actually. This is more a quirk of the motherboard/BIOS (or both), and not of the RAM installed. This is one reason why certain boards (actually, this tends to happen a lot with DFIs) have so many different BIOS revisions: The revisions are tailored to cater to certain RAM ICs (to facilitate RAM OCing/tweaking).
    
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post #17352 of 28692
So would it be an issue with the RAM or with the BIOS? This board used to run that divider fine with the other set of RAM I had.

As to the Hypertransport: one bump in voltage, I think about 50 mV, permitted me to run 1250 MHz.
     
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post #17353 of 28692
Thread Starter 
Quote:
Originally Posted by blitz6804 View Post
So would it be an issue with the RAM or with the BIOS? This board used to run that divider fine with the other set of RAM I had.
Depends what side of the tracks you're sitting on, seems to me. If the old RAM ran that divider fine, but your new RAM doesn't, assuming you haven't changed BIOS versions then it's a matter of perspective.

Clearly, though, the old RAM was more "compatible" (for lack of a better term) with that BIOS version.
    
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post #17354 of 28692
Well, this suck . My Opteron 185 refuses to run at 2.9 GHz with anything less than 1.48 vcore (it's actually set to 1.45 in the BIOS, but there's a bit of overvoltage and I tried the 1.425 setting without success). I tried every combination of multi's (both CPU and HTT) and voltages (NB and LDT) and this thing just will not run stably at less than 1.48 vcore...
post #17355 of 28692
Joe: I have changed BIOS version. Both RAMs are G.Skill, but one is set for a higher maximum divider than the other.

Decimate: That sometimes happens. Personally, I think 2.8 GHz is more than enough most of the time.
     
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post #17356 of 28692
Quote:
Originally Posted by blitz6804 View Post
Joe: I have changed BIOS version. Both RAMs are G.Skill, but one is set for a higher maximum divider than the other.
Blitz, do you know if the IC's are the same or different? What is the model number/part number on both kits?

Good luck
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post #17357 of 28692
Thread Starter 
Quote:
Originally Posted by blitz6804 View Post
Joe: I have changed BIOS version. Both RAMs are G.Skill, but one is set for a higher maximum divider than the other.
Have you tried your new RAM on both BIOS versions?
    
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post #17358 of 28692
Quote:
Originally Posted by txtmstrjoe View Post
This is correct. LDT Voltage (HT Voltage) overvolts supposedly improve the motherboard/chipset's ability to run at higher than default speeds (i.e., higher than 1000MHz/2000MHz double-pumped). On my ASUS A8N32-SLI Deluxe, where I run the HT bus at 1160MHz (290MHz x 4), I did not enable HT Overvolt (not that the BIOS supports granular voltage overvoltage control like DFI BIOSes do) to keep the system stable.

I would imagine each board to react in its own individual manner, so if you choose to run at higher-than-stock speeds on the HT bus you have to test the effects of LDT/HT overvolts.
Hue, this is how I view it. Although, after doing a little bit of reading I gather that the LDT is part of the i/o system or even CPU-CPU packet transport. Basically what intel would call the FSB.
So this has actually gotten me to re-think when to apply LDT voltage.

This is the thought I have rattling around in my head, guys tell me if it sounds out of whack.
LDT are the transport lanes between the peripherals (pci/pcie) and the CPU. And when you increase the HTT it can distort the signal and could cause errors, more than likely driver errors and the possibility of extension port loss. Such as GPU's not showing up and USB ports not working. etc. if you up the voltage, you might be able to stabilize your overclock and have your board be totally functional at the higher clock. Without having to compensate by either increasing vcore or NB voltage.

And yeah Hue, the DFi's, even my ultra-d's, have literally TONS of little tweaks and adjustments that you can do to almost every component of the board. They really are a treat to play with. Exceptional boards thats for sure.
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post #17359 of 28692
Quote:
Originally Posted by BlackOmega View Post
Hue, this is how I view it. Although, after doing a little bit of reading I gather that the LDT is part of the i/o system or even CPU-CPU packet transport. Basically what intel would call the FSB.
And yeah Hue, the DFi's, even my ultra-d's, have literally TONS of little tweaks and adjustments that you can do to almost every component of the board. They really are a treat to play with. Exceptional boards thats for sure.
BO would the Ultra D be in the lanparty family or series of mobo's?
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post #17360 of 28692
Thread Starter 
Quote:
Originally Posted by N2Gaming View Post
BO would the Ultra D be in the lanparty family or series of mobo's?
Yes they are, N2G.
    
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