OCUK Sandy Bridge, SB-E and Ivy Bridge 5GHZ Club

1Day or SimonMaltby,

Could you please tell me the max safe vcore I can put through a 2600k purely for benching not 24/7 please, and is tighter ram really worth it? i.e cas 9 at present and changing to cas 6.
 
Liquid said:
1Day or SimonMaltby,

Could you please tell me the max safe vcore I can put through a 2600k purely for benching not 24/7 please, and is tighter ram really worth it? i.e cas 9 at present and changing to cas 6.
Click to expand...
Probably not.
Max safe has been declared as 1.4V almost everywhere. Intel datasheet says 1.52V but there's been no official confirmation of this afaik although many have gone plenty higher.


Also, sorry to Adyx but could you please put me top of the 2500ks for the time being Simon - I couldn't help myself! Bit more voltage this time but happy with the score and no signs of death yet. :D

52ghz.jpg
 
Liquid said:
1Day or SimonMaltby,

Could you please tell me the max safe vcore I can put through a 2600k purely for benching not 24/7 please, and is tighter ram really worth it? i.e cas 9 at present and changing to cas 6.
Click to expand...



You can put as much vcore through your CPU as you are brave enough to do if you have good cooling. Seriously. And I am not talking about 24/7 before the howls start.

Let me expand. If your temps are below zero then you could put 1.7 volts into your CPU and for a few benching sessions that would not be an issue. There would be little or no point in doing that of course since your CPU frequency would be maxed out by the time you get to 1.65 volts anyway. But for purposes of this discussion it would not be a killer if you have cooling.

Now 1.55 volts would be too much if you do not have good water cooling. Or if your ambient was too high. As your CPU would hit upper 80's and 90's during the benchmark.

So at the end of the day it comes down to what are your temps like during the bench? Keep them low and you are good to go. :D

Second question. And funnily enough this is where CPU's get killed. :eek: Yip pushing for memory. People forget that the CPU does the memory controller work now and they put far to much stress on the IMC. The IMC will fail or degrade first before the core of the CPU will. So keep your vTT to reasonable levels and you will be good to go.

Cas 9 v Cas 6 at the same frequency is a huge difference. Cas 9 at 2000MHz v Cas 6 at 1333Mhz nah not even worth thinking about. It is the relationship between the two. Not one or the other that is important for benching.

Good question by the way.
 
Hi Yoga - in the real world no benefit at all that could be noticed. Your Cas 8 would provide better through put against the 1866. But do not be put off by higher Cas latency.

Have a look at this and you will see what I mean. It was written in 2007 :D by a very bright young man. All credit to Kris SOURCE

attachment.php


I've highlighted what I would consider to be the important trend in this graphic. The dark grey boxes correspond to high-performance bins...DDR-800 @ CL3, DDR-1000 @ CL4, etc. The light red boxes are closer to rated speeds for performance memory (often conservatively under estimated) - move one box the right for the particular speed grade in question to see the higher latency. The light green boxes can be best described as the 'ram and jam' settings (one box to the left). Sure DDR-1000 will do CL3....if you want to kill it in a week of 24/7 use.

The second point I would like to make is this: DDR3 is coming. Don't be scared by CL6, CL7 and *gulp* even CL9. If you continue the graph above, extending both into higher speed grades and higher latencies I am confident that you will find that the same trend continues. These "higher" latencies are a necessity in order to maintain the minimum signal sample and hold times required for proper data transfer.
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1Day said:
Cas 9 v Cas 6 at the same frequency is a huge difference. Cas 9 at 2000MHz v Cas 6 at 1333Mhz nah not even worth thinking about. It is the relationship between the two. Not one or the other that is important for benching.
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So with that said, if you can find a 1333mhz Cas 6 set of modules cheaper than a set of 2000mhz Cas 9 set, then you might as well go with the 1333?

Edit:- Also, are you completely safe if you don't push over 1.65v through the memory?
 
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1Day said:
You can put as much vcore through your CPU as you are brave enough to do if you have good cooling. Seriously. And I am not talking about 24/7 before the howls start.

Let me expand. If your temps are below zero then you could put 1.7 volts into your CPU and for a few benching sessions that would not be an issue. There would be little or no point in doing that of course since your CPU frequency would be maxed out by the time you get to 1.65 volts anyway. But for purposes of this discussion it would not be a killer if you have cooling.

Now 1.55 volts would be too much if you do not have good water cooling. Or if your ambient was too high. As your CPU would hit upper 80's and 90's during the benchmark.

So at the end of the day it comes down to what are your temps like during the bench? Keep them low and you are good to go. :D

Second question. And funnily enough this is where CPU's get killed. :eek: Yip pushing for memory. People forget that the CPU does the memory controller work now and they put far to much stress on the IMC. The IMC will fail or degrade first before the core of the CPU will. So keep your vTT to reasonable levels and you will be good to go.

Cas 9 v Cas 6 at the same frequency is a huge difference. Cas 9 at 2000MHz v Cas 6 at 1333Mhz nah not even worth thinking about. It is the relationship between the two. Not one or the other that is important for benching.

Good question by the way.
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Thanks for the info 1Day, i'm off to order some Mushkin Ridgeback:)
 
Can't get my 5ghz stable at around 1.4v on my 2600k so decided to get another one, also this one can't seem to post on a multi over 54. Getting new one via my work from a supplier who just got brand new stock yesterday so hopefully get a winner! :)
 
bobbydigital said:
Can't get my 5ghz stable at around 1.4v on my 2600k so decided to get another one, also this one can't seem to post on a multi over 54. Getting new one via my work from a supplier who just got brand new stock yesterday so hopefully get a winner! :)
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Try gettin the multi by reducing your Base Clock below 100, only a small amount eg 99.7
 
Right, bonjour all, i'm back with an updated bench. Bear in mind that this bench is not tested under prime at all but I had a chew around Monza in F1 2010 with it fine, don't really see the point of priming it as it won't be my everyday no way lol. I have settled on a 4.9 24/7 everyday and I couldn't be happier, I came from an [email protected]:D which I might add has done me proud over the years.

5387.jpg


Note - Please ask if you need a better quality one as I cant read the cpu speed easily but it is 5.386. If not good enough let me know and I will redo it.
 
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Liquid said:
Right, bonjour all, i'm back with an updated bench. Bear in mind that this bench is not tested under prime at all but I had a chew around Monza in F1 2010 with it fine, don't really see the point of priming it as it won't be my everyday no way lol. I have settled on a 4.9 24/7 everyday and I couldn't be happier, I came from an [email protected]:D which I might add has done me proud over the years.

5387.jpg
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Wow, nice effort!
What voltages are you seeing at 4.9GHz stable?
 
Your over clock is fine Liquid - the time taken for super pi and the clocks shown are in line with the scaling of the CPU.

Bobbydigital - you will need 1.440 vcore to get stable at 5GHz most of the time. So do not stress it.
 
It is looking good. I can not see what your voltages are so unable to comment on that. And CPU-z 1.56 does not read the correct SB voltages. Download 1.57. And of course you still have not got your 5GHz close yes but 5GHz not quite. :)

But assuming it is 1.3xx volts then you have a very very good CPU indeed.
 
1Day said:
It is looking good. I can not see what your voltages are so unable to comment on that. And CPU-z 1.56 does not read the correct SB voltages. Download 1.57. And of course you still have not got your 5GHz close yes but 5GHz not quite. :)

But assuming it is 1.3xx volts then you have a very very good CPU indeed.
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You're quibbling .1 of a mhz?!?! It changes by the second. I can prime at 5Ghz at 1.36volts as shown in the screenshot. Half an hour so far, still going though :)

Not sure whether to try for some more or not ;)
 
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