VTT / VDIMM etc... Mythbust attempt

[STEvil]

All of the DC specs (voltage at pads) are given in relation to current draw vs frequency and is also shown with respect to power plane resistance (applied VID to VCC tolerance for motherboard designers), a simple change between series updates (current and frequency guard band) is enough to knock the max DC specifications table off and alter the load line tolerance tables. The rest is down to changes the internal bus I/O stages on the more integrated platforms and their associated current limits (not all of those are shown publicly by Intel). The only glaring omission from the current white papers is the VTT load line tolerance for the Lynn/Clark series of CPUs (although this would have been provided to sub-vendors).

Kinda makes you wonder about the 1156 boards burning up.

[dinos22]

That Intel know what they are talking about (and that they don't pull these figures out of their a$$)

Intel in Australia will refuse warranty if you tell them you ran 1.65vdimm on your RAM

[HDCHOPPER]

Dam good read , nothing like learning something with my morning coffee

Wow dinos thay are forceing you guys to be liers :P

[josh1980]

1) Before Core i7, even the normal enthousiasts were running 2.4V Vdimm on a daily basis as there are kits even rated at 2V+ stock. This combined with the no-knowledge of the electrical safety zone of VTT/VDIMM (IMC/MEM) could have caused a high RMA-ratio. And that's something Intel most certainly wants to avoid, for super-dupper obvious reasons.

I'm somewhat confused. AMD doesn't have the same issues as Intel with regards to Vdimm and VTT...and the Core I7 was the first Intel CPU to have an integrated memory controller. Prior to the Core I7, DDR2 was used.

DDR2 per the JEDEC spec is 1.8v, with a maximum recommended voltage of 1.9v. JEDEC also gives a spec that memory modules must be able to withstand 2.3v without permanent damage, but they are not required to function at that level.

DDR3 per the JEDEC spec is 1.5v, with a maximum recommended voltage of 1.575v. JEDEC also gives a spec that memory modules must be able to withstand 1.975v without permanent damage, but they are not required to function at that level.

AMD's first official DDR3 support began Feb 2009 with the release of the AM3 Socket, while Intel released the first DDR3 support in Nov 2008 with the Core i7. Yes, Intel was technically first, and I'm not trying to start another damn AMD/Intel flamewar.

So, I'm confused. Are you mistakenly comparing DDR2 voltages to DDR3 voltages, AMD to Intel, or what?

[josh1980]

Dam good read , nothing like learning something with my morning coffee

Wow dinos thay are forceing you guys to be liers :P

Actually, they're asking you to use the product only as it was intended. Is that really too much to ask?

Perhaps you should read this thread "Promotion of fraudulent RMAs on XS"

Of course, I do see your smiley, so I hope your comment is only tongue-in-cheek.

[HDCHOPPER]

It was my morning coffee so yes it was "tongue-in-cheek" .

I like to think we all here at XS know the game.... You Gotta Pay To Play !