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Should I have trouble running 8Gb of 1.65v RAM on p67/z68? - Page 3

post #21 of 35
SB can run 1.65V with no problems. You should be fine!
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post #22 of 35
Quote:
Originally Posted by pioneerisloud View Post
From my understanding of it, VCCIO is your IMC's voltage. It's safe up to 1.20v. Having more than needed VCCIO isn't necessarily going to hurt anything at all. It might also help increase stability at a high overclock.

But that's why my VCCIO is at 1.20v. My VDIMM is at 1.70v to get DDR3-1950 out of my sticks. Can't seem to push them any harder. That's why I just bought 16GB of 1600 RAM at 7-8-7-21, 1.65v. I'm hoping they'll be able to push a little harder.

Keep in mind though, I have no troubles at all pushing my limits to the maximum I can go safely. I have warranty for a reason, and I will more than likely upgrade before the warranty expires anyway, and sell my parts for dirt cheap. As such, I definitely don't RECOMMEND pushing VCCIO to 1.20v and VDIMM to 1.70v. But its perfectly fine to run 1.15v / 1.65v respectively. Going more than that, you're pushing to the limits like I do.
Then it's time for me to start fine tuning my VCCIO Voltage.
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post #23 of 35
I run VCCIO 1.1 and DRAM 1.5... VCCIO helps stabilize my rig.
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post #24 of 35
Quote:
Originally Posted by TwoCables View Post
Then it's time for me to start fine tuning my VCCIO Voltage.
A lot of people also claim that BCLK has to stay at 100MHz. That's also false. I've been running anywhere from 103-106Mhz on mine since I built in March.

It's easy as pie to get that 4.5GHz mark. But to push more, it takes a lot of fine tuning. I think I'm at 104.55 x 45 right now for 4.7GHz, and DDR3-1950. Was trying to get the absolute most I could out of my RAM. Increasing my VCCIO made no difference to the vcore I needed to run for these clock speeds. It did have a SLIGHT affect on my load temperatures though. Could also have been ambients, or my bad cooler. Either / or.

All I'm saying, is that there's a LOT of tweaking that can be done on SB setups if you get bored with multi only. A lot of the times, those extra voltage options (VCCIO, PLL, and the other one that's name eludes me right now) also help by raising or lowering to get stable higher. It all depends on the individual CPU. Some need more VCCIO, some need less, same with PLL.

EDIT:
Post right above me proves my point. VCCIO of 1.1, VDIMM of 1.5v, and that's what helps him stabilize.
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post #25 of 35
VCCSA is system agent, if that's the one that was escaping you.
Also, how do you OC ram on SB? My mobo will only let me choose from the default options (1333,1600,1866,etc).
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post #26 of 35
Quote:
Originally Posted by csm725 View Post
VCCSA is system agent, if that's the one that was escaping you.
Also, how do you OC ram on SB? My mobo will only let me choose from the default options (1333,1600,1866,etc).
That's what it was, thank you.

Overclock RAM, just like its always been done. Set your divider, and increase BCLK. 104.55 BCLK x 18.66 RAM divider (to get 1866 at stock), gives me DDR3-1950. Anywhere from 105-110MHz is max safe on BCLK. It depends on what your board will boot with.

EDIT:
You can also decrease BCLK too. Say set 95MHz BCLK, and the 2133 divider. That gives you DDR3-2026.
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post #27 of 35
Ah, BCLK. Thing is I've heard SB boots at no more than 103-105 BCLK, and some even don't boot at 101.
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post #28 of 35
Quote:
Originally Posted by csm725 View Post
Ah, BCLK. Thing is I've heard SB boots at no more than 103-105 BCLK, and some even don't boot at 101.
The super cheapo boards won't do BCLK. It also has some effect to do with the CPU too. My first i5 could boot at 108MHz BCLK. This one (got a better binned chip 2 weeks after building) can only boot in at about 105.5MHz, same motherboard.

MOST, probably won't be able to boot in above 106-107MHz (or 94-93MHz).
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post #29 of 35
Okay - worth a try. Question: say I have a totally stable rig 100x44. If I change BCLK to 105x44 and it boots, is it guaranteed stable or not?
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post #30 of 35
Quote:
Originally Posted by pioneerisloud View Post
A lot of people also claim that BCLK has to stay at 100MHz. That's also false. I've been running anywhere from 103-106Mhz on mine since I built in March.

It's easy as pie to get that 4.5GHz mark. But to push more, it takes a lot of fine tuning. I think I'm at 104.55 x 45 right now for 4.7GHz, and DDR3-1950. Was trying to get the absolute most I could out of my RAM. Increasing my VCCIO made no difference to the vcore I needed to run for these clock speeds. It did have a SLIGHT affect on my load temperatures though. Could also have been ambients, or my bad cooler. Either / or.

All I'm saying, is that there's a LOT of tweaking that can be done on SB setups if you get bored with multi only. A lot of the times, those extra voltage options (VCCIO, PLL, and the other one that's name eludes me right now) also help by raising or lowering to get stable higher. It all depends on the individual CPU. Some need more VCCIO, some need less, same with PLL.

EDIT:
Post right above me proves my point. VCCIO of 1.1, VDIMM of 1.5v, and that's what helps him stabilize.
Oh. So then the reason why it was easy for me to reach 4.8GHz is because I'm leaving the BCLK at 100.0 and also my memory at stock!

However, my reason for leaving the BCKL at 100.0 is strictly because I'm not interested in overclocking my memory yet.
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It's a computer!
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