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Does memory speed affect overclocking? - Page 2

post #11 of 18
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Quote:
Originally Posted by Rokabud View Post
I'm also getting ready to OC for the first time, and have read that guide. While very informative, I've heard from other sources that methods for OCing Sandy Bridge CPUs is different (i.e. OCing through the multiplier, ignoring the BLCK.)

Also, that guide mentions a lot about the CPU: RAM ratio and its importance in system performance. So, while RAM speed doesn't affect your CPU's OC, it does affect the system's overall performance? Are CPU: RAM ratios still relevant?

I've also heard that since Sandy Bridge has a locked BLCK at 100 that it's best to get RAM with a frequency in even hundreds.

I've heard it's of paramount importance to get "undervolted" memory to have more headroom for overclocking. I've heard all of this and am wondering, all things considered, what are good attributes to look for in RAM when OCing?

In short, I'm really confused about the relationship between RAM and the CPU in regards to overclocking
Here's a guide I found specific to Sandy Bridge CPU's:
http://www.overclock.net/intel-cpus/...n-members.html

What I'm uncertain of is that he mention BLCK tampering, when I remember reading intel stressing very much to NOT touch the BLCK..
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post #12 of 18
Quote:
Originally Posted by Rokabud View Post
I'm also getting ready to OC for the first time, and have read that guide. While very informative, I've heard from other sources that methods for OCing Sandy Bridge CPUs is different (i.e. OCing through the multiplier, ignoring the BLCK.)

Also, that guide mentions a lot about the CPU: RAM ratio and its importance in system performance. So, while RAM speed doesn't affect your CPU's OC, it does affect the system's overall performance? Are CPU: RAM ratios still relevant?

I've also heard that since Sandy Bridge has a locked BLCK at 100 that it's best to get RAM with a frequency in even hundreds.

I've heard it's of paramount importance to get "undervolted" memory to have more headroom for overclocking. I've heard all of this and am wondering, all things considered, what are good attributes to look for in RAM when OCing?

In short, I'm really confused about the relationship between RAM and the CPU in regards to overclocking
lol relax. overclocking sandy bridge is really easy.

1. get some decent ram, doesnt have to be extreme performance stuff.. look at wat i'm using! g skill eco! lol and i can get my cpu to 5ghz no worries.

2. in sandy bridge ram and cpu oc arnt really linked since u dont have much room to play with the bclk so u dont HAVE TO oc ram to get good overclocks.

3. a lot of ram now comes at 1.5v, so u have a bit of wiggle room, but like i said u really dont need it with sb. i put mine on 1600 (rated) and tightened the timing a bit n its all good

SO in conclusion no need to be confused coz the bioses on the sb motherboards make it very easy to oc plus there ar heaps of good guides if u get stuck or overwhelmed.. like this:

http://www.bit-tech.net/hardware/cpu...ore-i5-2500k/3
post #13 of 18
Quote:
Originally Posted by hirolla888 View Post
lol relax. overclocking sandy bridge is really easy.

1. get some decent ram, doesnt have to be extreme performance stuff.. look at wat i'm using! g skill eco! lol and i can get my cpu to 5ghz no worries.

2. in sandy bridge ram and cpu oc arnt really linked since u dont have much room to play with the bclk so u dont HAVE TO oc ram to get good overclocks.

3. a lot of ram now comes at 1.5v, so u have a bit of wiggle room, but like i said u really dont need it with sb. i put mine on 1600 (rated) and tightened the timing a bit n its all good

SO in conclusion no need to be confused coz the bioses on the sb motherboards make it very easy to oc plus there ar heaps of good guides if u get stuck or overwhelmed.. like this:

http://www.bit-tech.net/hardware/cpu...ore-i5-2500k/3
Ty! That guide has the same BIOS I do.

So, there's no "sweet spots" for RAM, or recommended CPU:RAM frequencies?

Quote:
The ratio of CPU:RAM is known as a divider. On older Intel systems, best performance is achieved through highest possible stable operation in synchronous (1:1) CPU:RAM operation. On such systems, the higher the FSB, the better performance. Newer Intel systems can benefit from a divider that favors the RAM (e.g. 3:4 which means the RAM runs as 4/3 the external clock speed - the CPU always operates at the external clock speed). It is generally best to start with a 1:1 divider and then test other dividers for potentially greater performance.
The performance of the CPU and RAM are completely independent of each other now then? Is it impossible to bottleneck your CPU with RAM?
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post #14 of 18
well faster ram made a difference for my overclock.
I started with some Corsair dominators 1866 ram.
I could not get my overclock stable past 3.99
I got some Dominator 2000 ram and was able to achieve a 4.33 overclock.
This is with a i7-920 (2.66 stock)

My personal expierence- your results may vary especially with a different cpu.
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post #15 of 18
Quote:
Originally Posted by jonespwns View Post
On MY MOBO I can choose something called "linked" and "unlinked" when overclocking. If I choose LINKED the ram and CPU go up. and unlinked means you can choose what your FSB clock is, and your memory clock to what ever you want with out worrying about the CPU also going up.. So basically it depends on what your motherboard will let you do. Generally unlinked is where you want it to be if you are overclocking.
Hmm this has me even more confused. I thought both the CPU and RAM operated off the FSB, and achieved different speeds via their independent multipliers.

I thought the FSB=BLCK. Is this not true? I thought the base clock speed of the CPU was the speed at which both the CPU and RAM operated before multiplier. In some overclocking guides I've read they explain that its best to achieve the goal speed by having a higher FSB and a lower multiplier; so that while your CPU would operate at the same speed if you used a lower FSB and higher multiplier, it would be able to communicate with the RAM faster because of the higher FSB. What's happened since to change that?
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post #16 of 18
I want to bump this because I am interested in hearing more discussion about memory and overclocking the sandy bridge processors
post #17 of 18
they are both independant of each other, the overclocking is usually done by the multi as apossed to the blck that was used in previous generations. The memory is unlinked, therefore it is much easier to overclock on sandybridge.
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post #18 of 18
I have found that my 2500K needs a little less Vcore when my Vengeance is 1600 9-9-9-24-2t-1.5v VS 1600 8-8-8-24-1t-1.5v.

Probably because the memcontroller is on die.
    
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