EVGA 760, is this safe? VTT and Dram

[Tuxmask75]

Hey all...
Ive just upgraded my motherboard to an EVGA classified 760 motherboard. everything else is: I7 975 CPU, Gskill 2133 memory, 3 GTX285

Running my memory at 2142 MHZ but it requires a CPU VTT of 1.71 V
which is selecting CPU VTT of +400 in bios.
are there other voltages i could raise to trade off for lower CPU VTT?

another question for all u pros out there....
When i raise the CPU VTT by +400, does this effect Dram as well?
i ask this because i have my Dram set to 1.65 in bios,
But, When i check it in EVGA E-LEET TUNING UTILITY, it reports Dram as 1.71!!
i know that above 1.65 is considered dangerous.

also is 1.71 (+400) considered safe for CPU VTT?
heres what i have. any tweek sugjestions?


will push up some of the other settings for higher overclock soon.

[rusty]

looks too much for 4.1, here's mine

[Tuxmask75]

looks too much for 4.1, here's mine

whats your memory running at?
i was going to work up the QPI next i know mine runs stable at 205 so far, was just trying to find my memory overclock limit for now.


oh yeah i lowerd my dram to 1.6 in bios, shows up as 1.65 in E-LEET now.

[rusty]

I've used multimeter to see real volts mine needs 1.62v for dimm. Here's mine memory

[Tuxmask75]

are these voltages looken better for this clock?
also sems that without a VTT of 1.71 the computer wont even boot with the ram speed of 2133 mhz.

[rusty]

oh man why do you need such speeds like 2133 ? set you memory to 2:8

[rusty]

by the way what cpu cooling do you use ?

[Tuxmask75]

no idea, lol
would that give better data transfer rate?
the temps arnt so bad , 72 load for CPU and 33 motherboard temps..

[rusty]

I wouldn't keep mine vtt at 1.71 just for 1063 but that's up to you

[Tuxmask75]

I wouldn't keep mine vtt at 1.71 just for 1063 but that's up to you

Yeah your probably right.
not sure if u caught that 1063 x 2 = 2124 MHz

anyways heres my new overclock stable in everest. uhh so far at least.

anyone else with similar clocks out there could share there voltage experience with me?

[rusty]

maybe try other ram ?

[Tuxmask75]

Yeah i was just thinking about that. OCZ has some nice 2133 mhz memory!
this Gskill 17066 memory has given me problems from the beginning anyways, although i have it very stable now.
but it costs such a high VTT >__< ive reverted to using it at 1600 mhz which doesn't need so much juice.
i wonder, is this normal for such a high memory clock ?

[Tuxmask75]

I found some very usefull info here.
Although i havnt had any blowouts yet, im just going to run the current memory around 2000 MHZ.


((A quote from a review of that OCZ memory i was looking at))

The Intel Xeon W3540 was the only processor capable of accomplishing the task of running our stability testing at the specified DDR3-2133 with 8-9-8-24 timings. Our incredible clocking i7 920 can not even run DDR3-2000 so it didn't stand a chance with these sticks, and when trying our i7 975 processor in the EVGA X58 3X SLI, we had to turn VTT up so high that the stock cooling couldn't handle it and we blew the VTT PWM on that board. Needless to say, DDR3-2133 isn't going to be 24/7 stable for a lot of users, we would go as far to say many users.

The stress on the memory controller, which is located on the CPU, is so great at DDR3-2133 that many CPU's will need either too high a VTT or simply won't be able to run 24/7. The reason for this insane amount of stress isn't just the memory frequency, but mostly due to the uncore frequency that needs to run to reach DDR3-2133. The uncore runs at a minimum 2x the memory frequency. At DDR3-2133, that means an extremely high uncore clock of 4266MHz is required. Getting a CPU that runs 4266MHz at ambient temperatures for 24/7 stability is going to likely require at least 1.50v VTT if not more, even if it is an exceptional CPU.

This is why you will see substantially higher memory overclocks with this memory in our Extreme Overclocking section. When running a single threaded benchmark or one that isn't near as demanding on the memory or the memory controller, these modules will run as high as you want them to pretty much. The below overclocks are going to be our 24/7 overclock results that pass our full stability testing methodology, and are 100% limited by the CPU.


Source of info:

http://www.hardwarecanucks.com/forum...-review-5.html

[rusty]

you can get corsair or kingston or g.skill or patriot

[Leeghoofd]

Why on earth do you push Bclock as high ? You got an Extreme CPU, play with the multiplier. Much also depends on ya cooling and the IMC of your CPU... Have you tested lower ram speeds with tighter timings ? I run my OCZ blades at 1600mhz C6-6-6-18 with B2B 4 instead of 2000mhz C7-8-7-24 with a looser B2B (8).

I did some small tests on B2B with the Asus Gene II. I prefer lower volts for daily use than hig speed ram clocks/voltages and a small gain in write bandwith...

Gene II B2B Cas Delay