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AMD phenom overclocking limit? - Page 3

post #21 of 29
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Quote:
Originally Posted by latelesley View Post

Up to a point - they only GUARANTEE up to 1333 on DDR3 , but most folk can run 1600. It will probably default to 1333, but you just change the settings in the BIOS manually. I think you'd have trouble running it at 1866 though. Some one told me, when I was overclocking my chip, that Denebs are only good for about 1600 on the IMC. Mine crapped out at 1667 or thereabouts. It really depends on the memory and the chip, you may get lucky, and be able to run faster. smile.gif
So you mean RAMs which are 1600mhz were ones 1333mhz, but was overclocked to above1600mhz....?
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post #22 of 29
no yes...maybe - you'ev confused me! It was 1600 rated RAM. The board set them at 1333 by default, even thought they were 1600 chips. By manually setting them, I could get them to 1667 before the IMC crapped out. Does that make more sense? smile.gif
post #23 of 29
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Quote:
Originally Posted by latelesley View Post

no yes...maybe - you'ev confused me! It was 1600 rated RAM. The board set them at 1333 by default, even thought they were 1600 chips. By manually setting them, I could get them to 1667 before the IMC crapped out. Does that make more sense? smile.gif
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post #24 of 29
Thread Starter 
Quote:
Originally Posted by latelesley View Post

no yes...maybe - you'ev confused me! It was 1600 rated RAM. The board set them at 1333 by default, even thought they were 1600 chips. By manually setting them, I could get them to 1667 before the IMC crapped out. Does that make more sense? smile.gif
why would someone buy this http://www.amazon.co.uk/s/ref=nb_sb_ss_i_0_4?url=search-alias%3Daps&field-keywords=1866mhz+ddr3&sprefix=1866%2Caps%2C282 instead of this http://www.amazon.co.uk/Corsair-CMX8GX3M2A1333C9-XMS3-Memory-Module/dp/B003N8GVUY/ref=sr_1_2?ie=UTF8&qid=1364846779&sr=8-2?
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post #25 of 29
Almost got mine at 4.4 stable.. at 4.3 atm.
post #26 of 29
Most motherboards desined for overclocking will be able to run the DDR3 mush faster

It depend on the chipset rather then the CPU. That been say there is a bottle neck in the L3 catch. The L3 seems to run DDR3 1333 Mhz settings with 4-4-4-x timing or something, so the CPU will not be able to fully "use" the extra speed from the DDR3

Rising your HT clock is no go!! But rising NB clock will grant you LOTS of memory performance. I run my NB clock at 2800 MHz



As you can see i've topped out Read and close to Copy. So to gain from faster memory i'll will need higher FSB = higher heat = more unstably. I've done at LOT! of testing and found these setting to be the best for my rig, toke me a month to get it juust right biggrin.gif

Edit:
It's fully stable at 9-9-9-24-CR1, but since i can't gain extra Read power from it, there is no reason at all gaming vise. Losened to 9-10-9-27-CR2 to increse stability and have not had a single crash since biggrin.gif
Edited by Waszipa - 4/1/13 at 1:26pm
post #27 of 29
Thread Starter 
Quote:
Originally Posted by Waszipa View Post

Most motherboards desined for overclocking will be able to run the DDR3 mush faster

It depend on the chipset rather then the CPU. That been say there is a bottle neck in the L3 catch. The L3 seems to run DDR3 1333 Mhz settings with 4-4-4-x timing or something, so the CPU will not be able to fully "use" the extra speed from the DDR3

Rising your HT clock is no go!! But rising NB clock will grant you LOTS of memory performance. I run my NB clock at 2800 MHz



As you can see i've topped out Read and close to Copy. So to gain from faster memory i'll will need higher FSB = higher heat = more unstably. I've done at LOT! of testing and found these setting to be the best for my rig, toke me a month to get it juust right biggrin.gif

Edit:
It's fully stable at 9-9-9-24-CT1, but since i can't gain extra Read power from it, there is no reason at all gaming vise. Losened to 9-10-9-27-CT2 to increse stability and have not had a single crash since biggrin.gif
How do I understand what is going on here...?
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post #28 of 29
Wanted to show you what my settings made in memory performance

1600 MHz CL9 are fine memory for the 965
1866 MHz CL9 or 1600 MHz CL8 are killer for the 965

More then that are overkill = you'll not gain mush if any gaming performance. That is as long as you have a high NB clock

I mean you do know that the old saying "CPU win over Memory, always!" is dead?? There is no point in you pressing your CPU to 4.4 GHz without fast memory. If there is your aim isn't gaming performance, but rather just to test what the chip can do. Right?
Edited by Waszipa - 4/1/13 at 1:36pm
post #29 of 29

The simple reason is that the first memory is more than likely going to run faster than the second kit. By choosing the 1866 kit, you know the memory will not be the limit for memory speed, it will be the IMC in the CPU that will create the limit. if you use the 1333 ram, and overclock, then it is less certain, it could be the memory itself that causes it to crap out at faster speeds, OR it could be the IMC. If you use the 1866 memory, chances are its the IMC that's crapping out first. It means theres less variables to worry about when overclocking the RAM. when the 1333 BSODs. you have to decide whether to raise the RAM voltage or the IMC voltage. IF you use the 1866, you can probably guarantee its the IMC voltage you need to tweak. Also the chances are the 1866 will run at a higher speed once overclocked than the 1333 kit will. IE you might get 1667 out of the 1866 kit, but only 1430 out of the 1333 kit. (in the first case, the CPU IMC limits the overclock, the second case the RAM can be the limiting factor.)
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