Max voltage for TWIN2X2048-6400C4?

[digitalforce]

I have four 1 gig chips of TWIN2X2048-6400C4 (4 gig total) on a Gigabyte P35 and a G0 stepping Q6600.

 

Using 4-4-4-12 timings at 2.1v, I can get a stable 1:1 overclock of about 930mhz. I have seen in some reviews, that people can get as much as 1000mhz with these chips.

 

My question is, I can get a bit of higher overclock with 2.2v but I don't want to fry my chips. I have tons of cooling on my chipset and RAM area so heat is not a concern. Should I keep pushing voltage or just loosen the timings to 5-5-5-18?

[DerekT]

Using 4-4-4-12 timings at 2.1v, I can get a stable 1:1 overclock of about 930mhz. I have seen in some reviews, that people can get as much as 1000mhz with these chips.

 

Not with 4 X 1024 they can't.

 

My question is, I can get a bit of higher overclock with 2.2v but I don't want to fry my chips. I have tons of cooling on my chipset and RAM area so heat is not a concern. Should I keep pushing voltage or just loosen the timings to 5-5-5-18?

 

It's your choice. I run my 8500C5's at 2.35v and they default at 2.2v. I have forgone my warranty with my raise and even though I am using active cooling on them, the warranty is done. The DRAM will show the characteristics of the overvolt for RMA testing.

[digitalforce]

Thanks for the reply. I actually have my chips running at 5-5-5-18 @ 1000mhz stable right now.. but don't know how big of performance difference it is between 4-4-4-12.

 

I know that the Corsair recommended max is 2.1v for these chips but I am wondering what the real world safe max is since I have tons of cooling on my chipset/cpu/RAM..

 

Just like the Quad Core Q6600 recommended voltage from Intel is 1.35v.. but if you have proper cooling, peeps are running stable up to 1.55v

[DerekT]

Thanks for the reply. I actually have my chips running at 5-5-5-18 @ 1000mhz stable right now.. but don't know how big of performance difference it is between 4-4-4-12.

 

I know that the Corsair recommended max is 2.1v for these chips but I am wondering what the real world safe max is since I have tons of cooling on my chipset/cpu/RAM..

 

Just like the Quad Core Q6600 recommended voltage from Intel is 1.35v.. but if you have proper cooling, peeps are running stable up to 1.55v

 

Keep in mind that with your overclock at 4 strips, the electron migration levels do increase, and that they are cumulative and degenerative. In other words, the migration's effects build up and increase in severity over time. This is somewhat beyond the coolings effects, and is a reason why there is a maximum. I run mine at 2.35 and realize that my warranty is defunct. The migratory effects on the DRAM due to the raised voltages will show on warranty tests. Just as one can not exactly state the need and damage 1.55v will do on one CPU vs another, and only give an estimate, the same is so for the DRAM.

 

So, the prevailing rule of thumb is that anything over 2.4v, no matter what cooling will very likely bring about errors in the longer term. If not cooled well, then far less voltage can do this in the longer term. The long term is not all that long either. Four to six months can often be enough.

 

It's all up to you. If you are lucky enough to be running with 4 X 1024 at 1000Mhz with 6400Mhz DRAM, then you are already very lucky. I have not yet seen such a move, even with 4 X 1024 of 8500 D9GMH/D9GCT. I wonder at your voltage already...

[digitalforce]

I am 2.1v right now with 1000mhz @ 5-5-5-18

 

So.. You are thinking that 2.3 or so is safe? I know they aren't 100% proven but just wondering.

[DerekT]

I am 2.1v right now with 1000mhz @ 5-5-5-18

 

So.. You are thinking that 2.3 or so is safe? I know they aren't 100% proven but just wondering.

 

It depends on a lot of variables. Some DRAM does not do well with voltages, some does. If you have ProMos chips, then a raise in Vdimm will not bring about any great tightening or more bandwidth. Find out what your IC chips are first.

 

http://www.houseofhelp.com/v3/showthread.php?t=57334

[digitalforce]

Der... looks like I have Elpida RAM. WTF is up with that? Isn't that crap RAM with a Corsair label?

[digitalforce]

Der... looks like I have Elpida RAM. WTF is up with that? Isn't that crap RAM with a Corsair label?

[DerekT]

Der... looks like I have Elpida RAM. WTF is up with that? Isn't that crap RAM with a Corsair label?

 

Elpida is not crap DRAM. All DRAM end reseller companies use DRAM manufacturers chips from many DRAM manufacturing companies. Even Micron which makes the famous D9's buys Elpida, ProMos, etc. and brands them for their mid to low level DRAM. Only their high end DRAM gets their Microns. 6400 is not high end anymore. It is at the mid level. If you are expecting high end DRAM with high end overclocking abilities then you need to research and purchase the DRAM that fits that level as I and all other enthusiasts have. There is a limited supply of high end DRAM at any time and as the level of speed increases, the lower levels drop to the mid end. This is normal in any form of technology. As DDR3 continues to increase, you will find all DDR2 will become mid line and the best chip fabs will be relegated to the creation of DDR3. You can see this move already. It is the way of technology.

 

Corsair is one of the few DRAM companies that individually tests and bins singular IC's. This way they can marry the best of the batch with the best. Most companies buy them pre-binned and can not do this. This is why Corsair's headroom is so high compared to many other companies. Look at what you have gained from your 4 sticks of 6400C4s.

 

I have taken the Elpida 6400C4 RAM to 1000Mhz with 5-5-5-15 on two sticks. Now you have done this and to 1000Mhz with 4 sticks in your board and now the DRAM is crap?

 

You need to look at reality. You have some very fine producing DRAM at the price point you paid.

 

I'm amazed at your prior post. Simply amazed!! :bigeyes:

[DerekT]

Der... looks like I have Elpida RAM. WTF is up with that? Isn't that crap RAM with a Corsair label?

 

Elpida is not crap DRAM. All DRAM end reseller companies use DRAM manufacturers chips from many DRAM manufacturing companies. Even Micron which makes the famous D9's buys Elpida, ProMos, etc. and brands them for their mid to low level DRAM. Only their high end DRAM gets their Microns. 6400 is not high end anymore. It is at the mid level. If you are expecting high end DRAM with high end overclocking abilities then you need to research and purchase the DRAM that fits that level as I and all other enthusiasts have. There is a limited supply of high end DRAM at any time and as the level of speed increases, the lower levels drop to the mid end. This is normal in any form of technology. As DDR3 continues to increase, you will find all DDR2 will become mid line and the best chip fabs will be relegated to the creation of DDR3. You can see this move already. It is the way of technology.

 

Corsair is one of the few DRAM companies that individually tests and bins singular IC's. This way they can marry the best of the batch with the best. Most companies buy them pre-binned and can not do this. This is why Corsair's headroom is so high compared to many other companies. Look at what you have gained from your 4 sticks of 6400C4s.

 

I have taken the Elpida 6400C4 RAM to 1000Mhz with 5-5-5-15 on two sticks. Now you have done this and to 1000Mhz with 4 sticks in your board and now the DRAM is crap?

 

You need to look at reality. You have some very fine producing DRAM at the price point you paid.

 

I'm amazed at your prior post. Simply amazed!! :bigeyes:

[digitalforce]

Sorry DerekT, I didn't mean to make it sound so harsh. I just thought that Elpida was low end RAM so I was amazed at the speeds I am running.

 

Thanks for the explanation and I am just glad I can hit 1000mhz stable :)

 

Thanks for your help!

 

I still don't dare to run these higher than 2.1v just to stay at 4-4-4-12 on my overclock. I am at 5-5-5-18 and I can't tell a difference in general Windows usage or games.

[digitalforce]

Sorry DerekT, I didn't mean to make it sound so harsh. I just thought that Elpida was low end RAM so I was amazed at the speeds I am running.

 

Thanks for the explanation and I am just glad I can hit 1000mhz stable :)

 

Thanks for your help!

 

I still don't dare to run these higher than 2.1v just to stay at 4-4-4-12 on my overclock. I am at 5-5-5-18 and I can't tell a difference in general Windows usage or games.

[DerekT]

Sorry DerekT, I didn't mean to make it sound so harsh. I just thought that Elpida was low end RAM so I was amazed at the speeds I am running.

 

Thanks for the explanation and I am just glad I can hit 1000mhz stable :)

 

Thanks for your help!

 

I still don't dare to run these higher than 2.1v just to stay at 4-4-4-12 on my overclock. I am at 5-5-5-18 and I can't tell a difference in general Windows usage or games.

 

I agree with you. When you are running at 1000MHz it's pretty fast. It's theoretical bandwidth after that 99% of the time. It's like having a doorway that can allow three in a row to walk through it but only two ever do. Diminishing returns. As I said, 4 X 1024 and you are fully stable with 6400 @ 1000Mhz. Amazing!!!

 

Some do not even get the system running at a drop. 800Mhz to 667Mhz and here you are at 1000 :bigeyes: Those are great DRAM strips and a great fit with your motherboard. I bet you could buy 10 more boards and not get the DRAM to marry this well to them.

 

It's the luck of the DRAW. I thought you were playing me in the beginning. Read my response... :D:

[DerekT]

Sorry DerekT, I didn't mean to make it sound so harsh. I just thought that Elpida was low end RAM so I was amazed at the speeds I am running.

 

Thanks for the explanation and I am just glad I can hit 1000mhz stable :)

 

Thanks for your help!

 

I still don't dare to run these higher than 2.1v just to stay at 4-4-4-12 on my overclock. I am at 5-5-5-18 and I can't tell a difference in general Windows usage or games.

 

I agree with you. When you are running at 1000MHz it's pretty fast. It's theoretical bandwidth after that 99% of the time. It's like having a doorway that can allow three in a row to walk through it but only two ever do. Diminishing returns. As I said, 4 X 1024 and you are fully stable with 6400 @ 1000Mhz. Amazing!!!

 

Some do not even get the system running at a drop. 800Mhz to 667Mhz and here you are at 1000 :bigeyes: Those are great DRAM strips and a great fit with your motherboard. I bet you could buy 10 more boards and not get the DRAM to marry this well to them.

 

It's the luck of the DRAW. I thought you were playing me in the beginning. Read my response... :D:

[java_ed]

Yep, that is amazing result and he was complaining.. :laughing:

 

I have 2 pairs of the 6400C4 running on eVga 680i. The highest I can run is DDR2-900 with 4-4-4-12, 1:1. Anything above I have to relax timing to 5-5-5-15 and I only got to DDR2-925.

 

Fortunately, I am not an extreme overclocker. I run my E6750 at 3.2Ghz and 1.95v for the memory. I have lowered the voltage as low as 1.8v.