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post #931 of 8074
Quote:
Originally Posted by centvalny View Post

Thanks Bullant:)

Trying to find sweet spot on subzero for these C10 sticks.

It gave lot of "55" and stuck @ loops 6~10ish if colder than -15C
Yeah you definitely found the sweet spot,if you don't mind me asking what dram voltage,2v?
post #932 of 8074
Yep, it was 2.0V.

It also won't stay stable if temp. warmer than +10ish C, kinda weird with this small window of -5C ~ +5C for samsung.

I use DI which is perfect for subzero higher than -15C


Edited by centvalny - 3/24/13 at 7:22pm
post #933 of 8074
Quote:
Originally Posted by centvalny View Post

Yep, it was 2.0V.

It also won't stay stable if temp. warmer than +10ish C, kinda weird with this small window of -5C ~ +5C for samsung.

I use DI which is perfect for subzero higher than -15C

Yeah very small window,nice pic
post #934 of 8074
So, I've done some playing around, how does this look? I know it's not nearly 'up to par' with what you guys are capable of... but this is my first attempt oc'ing my ram.
Stock = 1600mhz CL7-8-8-24 @1.5v (Corsair Vengeance v4.13)



I can pass hyperpi32m, 10 runs of IBT using 90% of mem, a few hours of Crysis 3... and pretty much any benchmark I can throw at it. Can I consider these stable? The only thing I haven't done is an extended p95 run (12-24hrs of downtime isn't easy for me).

I've tried 2400 @ CL10-12-12-36, but it takes 1.7v+ and still likes to just hardlock my pc randomly. Not sure why, they pass hyperpi32m, 10 runs of IBT... u guys think they might need more voltage? or is it something else (vccsa, vccio? haven't tried them much higher than you see in the pic), as I'm able to do 2200 CL9-11-11-30 @ 1.575v. Does ram have a "voltage wall" like a cpu? Seems like a big voltage bump to get there. Trying them at 2600 CL11, and I can boot into windows, but get the same behaviour, random hardlocks.
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post #935 of 8074
What CAS write latency does your board default to when trying 1200/1300MHz? If it's 7, you might fail because of that.
post #936 of 8074
Quote:
Originally Posted by Sam OCX View Post

What CAS write latency does your board default to when trying 1200/1300MHz? If it's 7, you might fail because of that.

For 2200 I think I can get away with it, but the board defaults my tWCL to 8 at all speeds. When I've tried 1200/1300 I've just left 2nd's at 'auto' and set loose 3rd's (6's) for stability sake until I figure out how low I can get the main timings at the current voltage (not really sure if that's a good approach, please comment on this) should I try tWCL @ 9? I've noticed in most of the screenies posted here that you guys keep it pretty low, like 6-7.

EDIT: here's my 2400... stable for now, but might hardlock in a few hours, or a few minutes, sometimes while idling, sometimes loading... it really seems random. memtest86 will pass 2 times no errors, as will hyperpi32m.



I put my spd's in there in case it helps.

EDIT 2: That 2400 is at 1.7v.
Edited by Grimly - 3/26/13 at 2:05pm
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post #937 of 8074
sig rig (z77x-ud5h, i7-3770k, 2x2gb mushkin enhanced blackline ridgeback 996902 2000 7-10-8-27 1t 1.65v )

Could I replace the thermal pads used to hold my RAM heatspreaders on with some high end sekusui thermal tape? Why is thermal pads used instead of thermal tape, ever? I mean wouldn't tape, especially high end tape, always be better?

My RAM currently hits about 49*C temp as a max temp during stress testing (for a 24/7 overclock, mind you, and only in prime95 during larger ffts, usually its in lower 40s anyways). As I understand, 50*C is the max temperature for RAM before you do permanent damage? I'm a bit confused on that, but anyways, wouldn't replacing the thermal pads with tape help a lot?

edit: Is it true that 4 sticks of ram is always better than 2? I had heard from someone that 4 sticks of RAM will have better bandwidth, despite overclockling slightly lower, than just 2 sticks. I mean the reason I'm going with 2GB density sticks is because you can get 2x2GB PSC ram capable of 2400mhz on tight timings for 24/7 overclocks around $20-30, whereas for $50 on 2x4gb your lucky to get 1866mhz.
Edited by Belial - 3/27/13 at 10:29pm
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post #938 of 8074
Thermal pads are easy to apply and remove, plus they are dirt cheap - that's why makers use them.
Replacing thermal pads with tape won't help as much as organising better airflow around the memory area.
The only are where you're going to notice the difference between 2 and 4 sticks are synthetic benchmarks (AIDA64 and SuperPi 32M). In daily use there will be no measurable difference whatsoever, but running 4 sticks raises the chances of failure so that's why it's recommended to use 2.
post #939 of 8074
So I figured I should make an update, as I've made some big progress thumb.gif... waddaya guys think of this?



So Sam, remember when you said they should do 2400 @ CL9?... well you were right (probably not much of a surprise, LOL). As you see in the pic, I hadn't previously noticed the "memory controller 1.20v" spec for this ram. Turns out, that's what was causing my random hard locks. Since then, I did a little more playing around, and I think leaving my 2nd's on 'auto' was a mistake as well... I believe they were being set too loose at higher speeds and causing errors in memtest86. So I dialed in the 2nd's that the 'auto' was picking up at the XMP setting of 1600mhz and went from there, tCWL was set lowered to 7 and still seems stable, so far, as you can see in the pic. My ram is playing much nicer now with VCCSA @ 1.20v (using Asus MVF, 3570k). I had a memTweakit score of 52k when I was at 2200 cl9,11,11,30 @1.65v with even lower subs then you see in the pic, I should play around with that one a bit more.
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post #940 of 8074
Quote:
Replacing thermal pads with tape won't help as much as organising better airflow around the memory area.

The only are where you're going to notice the difference between 2 and 4 sticks are synthetic benchmarks (AIDA64 and SuperPi 32M). In daily use there will be no measurable difference whatsoever, but running 4 sticks raises the chances of failure so that's why it's recommended to use 2.

You should really change your name to captain obvious. The replies you make to my questions are always just terrible. I'm well aware that more airflow would be way more important, i mean it's common knowledge that the ram heatspreaders do very little for cooling the ram. And I'm well aware of how minute ram overclocking differences are, but you are aware this is OCN and the ram overclock thread, right, and you are talking to the guy who did 24 hours testing on every single tertiary timing. This isn't all about practicality, I enjoy finding my best 24/7 overclock on absolute stability...

4 sticks raises the chances of failure... what? If you mean 4 sticks is going to oc slightly less than 2, yes, I just said that in my post. I'm asking about some stuff I had heard about the idea that 4 sticks of ram, despite being on a slightly lower ovwerclock, will have a higher memory bandwidth. I think my post makes clear that I'm well aware of the pitfalls of using 4 sticks of ram as opposed to just 2. For example lower VRAM GPU's overclock higher than higher VRAM GPUs - does that mean it's stupid to buy higher VRAM GPUs? No, especially since higher VRAM GPUs also perform better at equivalent clocks, making up for the very slight overclock advantage of less VRAM restricting the GPU.

I don't know for sure, but I think you can run ram at 1.75-1.8v overclocks 24/7 without a heatspreader, that's just how irrelevant they are. I'm just asking if there's a reason for thermal pads over thermal tape. Cheap, I'm sure, but cheap thermal tape exists too.

Please. I think I make clear in my posts I know about the obvious, and that I'm asking for something a little more advanced.

Oh, and there's no way in heck I'll be able to afford RAM capable of 2400mhz CL8 on just 2x4 sticks of RAM. Yes, ideally, you just use 2 sticks of RAM at 2400mhz, but that costs what, like $100+? Why would I do that, you can find PSC RAM in 2x2GB kits for $20, for $40, the same price of the cheapest 2x4GB RAM, I can have extremely fast ram.

4 sticks of PSC capable of 2400mhz, will overclock way further than 2 sticks of 4gb density sticks of equal price, ie ~$40, even if you have to drop a timing or tw on the 4 sticks of PSC. Oh not, its 2400mhz CL8-9 instead of 2400mhz 8-8, how will it compare to 1333mhz CL9 2x4gb ram! That's why 4 sticks of ram is way better than 2, for value and price to performance.

Also, I'm not just a general user, I have a popular stream, so RAM performance is actually quite important for me, as you need at least 2000mhz RAM for a really good stream (well, it's recomended to have at least 2000mhz, and yes, ram speed is very important, more important than timings, for streaming, even on AMD systems). The difference in 2400mhz and 1866mhz ram is actually quite noticeable (i already posted synthetic benches in this thread showing 2400mhz CL8 RAM just being wayyyy better than 2200mhz CL7, and 2000mhz CL7, I'll be posting real world benchmarks in streaming+gaming soon).

Now obviously even 2400mhz vs 1866 isn't a huge difference, like 500mhz overclock on CPU, but I am spending $40 for PSC RAM 8gb. Which is basically the same price as 4x2gb of crap ram, or 2x4gb of similiarly priced RAM. Heck, the performance boost of 1600mhz to 2400mhz, especially for what I do, streaming, is very much worth paying a good $20+ for, i mean that's a huge boost in performance relative to the money. Especially when it's literally spending zero extra dollars for over 1000mhz in RAM speed.
Edited by Belial - 3/28/13 at 5:59pm
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Samsung 830 128gb Corsair H110 w/4x 140mm Yate Loon High Blues W7 x64 Ultimate Yarrgh Matey Dell U2312HM Matte IPS 1080p 
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Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
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Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
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Bitfenix Recon Fan Controller Moded 
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Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
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Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
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Hax'd W7 Ultimate 64-bit Sanyo DP19640 19'' KDS Radius Rad-7xp 17'' Ducky 1087 MX Brown 10keyless 
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Other
Colonial Blue Paracord Sleeving 
CPUMotherboardGraphicsRAM
Phenom ii X4 955C2, $31, 5 broken pins, works! ... Biostar A770e3 6.3 Red&Black MSI GTX 460 768mb Twin Frozr II 2 x 2GB Kingston HyperX 1333 OC to 1348CL7@1.65v 
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