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Vccio and Vccsa Question

post #1 of 8
Thread Starter 
Okay this is just a quick question. I am running the rig I have in my description.

I am getting into RAM overclocking and have easily managed to get to 1866Mhz from 1600 and I plan to push further as it is stable and temps look nice, my question is the following:

I know that the Dram voltage shouldn't go past 0.5V when compared to my vccio (vtt) however on this board I cannot see this voltage! The RAM is stable at about 1.6V, but since I cannot see the VTT I cannot tell whether this is safe or not. I still have some fine tuning so I would be running it at 1.6V forever, and for now I've placed the settings back to stock.

I was told that increasing the Vccsa voltage would offset the vccio voltage meaning that if I set it to say 1.0V I would be fine with the 1.6V on the DRAM. Simply put, is there any way that I can get to this voltage to get its value? It's not an option in my motherboard nor is it in AI Suite.

Thanks.

Ps. keep in mind the 1.6V is just temporary. I kinda just threw it in and ran because I knew it was a voltage that wouldn't fail.
Edited by Millz59 - 4/22/13 at 8:45pm
post #2 of 8
the only thing i messed with was the VCCSA to get my RAM stable @ 1866 1.6v

btw the the VTT (vccio) voltage is used for the same as vccsa in the bios. here are whats spec'd and suggested:

Edited by looniam - 4/22/13 at 10:24pm
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loon 3.2
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by looniam View Post

the only thing i messed with was the VCCSA to get my RAM stable @ 1866 1.6v

btw the the VTT (vccio) voltage is used for the same as vccsa in the bios. here are whats spec'd and suggested:

Thanks for the input tongue.gif

So if I increase VCCSA to 1v I should be good to go? That will cause the VCCIO to be within 0.5V of the 1.6V on the Dram?

I don't really know why Asus won't allow me to see the value of the voltage. It seems that they linked VCCSA and VCCIO on their non ROG motherboards, which I'm okay with for the most part except I can't tell if the IMC is working too hard or not because I can't tell the value of the VCCIO only that of the VCCSA.
post #4 of 8
1.1 is fine.

i jacked up to 1.2 vccsa and 1.65 voltage on the dimms just to post. (oh and loosen the timings a bit)

i would reboot and lower the dimm voltage a notch at a time in between posts until i got to 1.55 on the dimms. then i lowered the vccsa a notch at a time until i got back down to 0.971

that got me into windows but not stable when testing, so i had to raise the dimm up to 1.59, which is actually 1.61 according to the bios.
please keep in mind i have crucial low voltage 1600. i was a little disappointed that in reviews i read they just simply jacked up the bandwidth to 1866 and it was all good. but that was with 2x8 kits whereas i have a 2x4 kit. don't know maybe different ICs . .

if you have the time and patience; do a bit of looking around for some overclock settings; it ought not be hard for those vengeance are rather common. raise up the vccsa and vdimms without being silly and loosen the timings. once you get the vdimm voltage down, you can do the same with the vccsa and then tighten the timings back up.

oh, and write down the settings incase you have to use the memok button, it restore the settings back to default. thumb.gif
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loon 3.2
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by looniam View Post

oh, and write down the settings incase you have to use the memok button, it restore the settings back to default. thumb.gif

Haha I know this all too well.

Anyways, thanks for the help, but I've managed to get my RAM to run at 2133MHz at the stock voltage of 1.5V along with the timings of 10-11-11-27. I'm fairly happy with that considering I pretty much just altered the timings and set the clock speed. I'm going to run a memtest right now to see if it's really stable, as I've been playing BF3 a bit to see if it could handle general gaming well.
post #6 of 8
Quote:
Originally Posted by Millz59 View Post

Thanks for the input tongue.gif

So if I increase VCCSA to 1v I should be good to go? That will cause the VCCIO to be within 0.5V of the 1.6V on the Dram?

I don't really know why Asus won't allow me to see the value of the voltage. It seems that they linked VCCSA and VCCIO on their non ROG motherboards, which I'm okay with for the most part except I can't tell if the IMC is working too hard or not because I can't tell the value of the VCCIO only that of the VCCSA.

The 0.5V difference doesn't apply to sandy bridge and ivy bridge.


Source
post #7 of 8
Thread Starter 
Quote:
Originally Posted by atomicmew View Post

The 0.5V difference doesn't apply to sandy bridge and ivy bridge.


Source

Well that would explain a lot then. Thanks for that! Altough since I last posted I was doing a bunch of memtesting and it came up with no errors at 2133MHz 10-11-11-27 @ 1.5V so I'd say that I don't really need to worry regardless since I'm still running stock voltages. Maybe I'll go for 2400 then wink.gif

Just got to 10-11-10-24-2T
Edited by Millz59 - 4/25/13 at 2:38pm
post #8 of 8
thumb.gif very awesome for stock voltages!

color me a bit jealous . .when i got the crucial low volts i read that they do overclock a good bit but wasn't too interested in that, just wanted something better than the 1333 PNYs i had at the time - reused from an H67/ i3 build.

but after spending most of a day getting my machine to post and then stable, this overclocking the ram is a bit more addictive than i thought at first . . lol.
loon 3.2
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i7-3770K Asus P8Z77-V Pro EVGA 980TI SC+ 16Gb PNY ddr3 1866 
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loon 3.2
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7-3770K Asus P8Z77-V Pro EVGA 980TI SC+ 16Gb PNY ddr3 1866 
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PNY 1311 240Gb 1 TB Seagate 3 TB WD Blue DVD DVDRW+/- 
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EKWB P280 kit EK-VGA supremacy Win X LG 24MC57HQ-P 
KeyboardPowerCaseMouse
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