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Old 05-13-2011, 09:55 AM   #1
Agencyman
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i7-2600K and FSB

Need an experienced hand to offer some guidance.

(I tried reading through the 4GHz club, and few posts showed the processor without going to the enlargements, but one or two had FSB's of around 100.)

I'm used to C2D with 400+ FSB speeds, and this is important for best actual crunching throughput.

I just built and delivered, (no more time to experiment), a customer unit of this processor and an ASUS Maximus IV.

I delivered it at 4.6 GHz, FSB 100MHz, and what seems a horrible FSB/DRAM of 1:6, but didn't have time to try to bump the FSB, don't even know if I can do that and leave CPU idle-down characteristics operational.

TIA!,
Bruce Hinton
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Old 05-13-2011, 10:01 AM   #2
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SB oc with the multi not FSB
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Old 05-13-2011, 10:36 AM   #3
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These don't have FSB. These have QPI. The BClk = Base Clock = 100MHz. The BClk can be changed only slightly. The CPU multiplier on unlocked chips is where the OC comes from. The 1:6 "FSB": DRAM is different because, higher speed of DDR3 RAM. That puts your RAM @1200, probably underclocked.
To explain the BClk further, to overclock these platforms, you would leave the BClk @100, then raise the multi of everything else.
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Old 05-13-2011, 10:59 AM   #4
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Quote:
Originally Posted by RyninDaCleM View Post
These don't have FSB. These have QPI. The BClk = Base Clock = 100MHz. The BClk can be changed only slightly. The CPU multiplier on unlocked chips is where the OC comes from. The 1:6 "FSB": DRAM is different because, higher speed of DDR3 RAM. That puts your RAM @1200, probably underclocked.
To explain the BClk further, to overclock these platforms, you would leave the BClk @100, then raise the multi of everything else.
Thanks for the confirmation guys! That is exactly what I did to get the 4.6GHz. Left BCLK at 100 even, I did tweak a couple of voltages VERY slightly. The RAM is four sticks of:
  • Module Size: 2GB
  • Package: Ballistix 240-pin DIMM
  • Feature: DDR3 PC3-12800
  • Specs: DDR3 PC3-12800 8-8-8-24 Unbuffered NON-ECC DDR3-1600 1.65V 256Meg x 64

Amazing processor and board.

Bruce
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Old 05-13-2011, 11:36 AM   #5
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For future reference, as others have stated current generation Sandy-Bridge processors do not change their bclk frequency. On some boards it is technically possible to do (with K series processors), however you can only get about 5MHz at best before it will become unstable. Sandy-Bridge chips are designed to be overclocked by the multiplier only.

The down side to this, as you've noticed, as that you pretty much completely loose the ability to overclock your RAM with anything finer than changing the BCLK: DRAM ratio.

Last edited by AruisDante : 05-13-2011 at 01:16 PM.
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Old 05-13-2011, 12:42 PM   #6
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The down side to this, as you've noticed, as that you pretty much completely loose the ability to overclock your RAM with anything finer than changing the BCLKRAM ratio.
Now that is what I wished to have time for: Based on the RAM specs., above, what do you guess would be the potential for a better ratio?

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Old 05-13-2011, 12:49 PM   #7
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Run DRAM @8x or 1:8 ratio. Gives you 1600MHz. Set to rated voltage and timings.
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Old 05-13-2011, 01:48 PM   #8
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Originally Posted by RyninDaCleM View Post
Run DRAM @8x or 1:8 ratio. Gives you 1600MHz. Set to rated voltage and timings.
Thanks for the info, I will see about the ratio change. Odd to go the other way from trying to get to 1:1!

The timings are at spec 8-8-8-24, V is 1.65 also on spec.

Bruce
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Old 05-13-2011, 02:33 PM   #9
Slizzo
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Aye, as long as the memory is running at it's rated speed you'll be OK. I haven't messed with ratios in a long time. As long as my memory is at or near the rated speed, and my processor is overclocked, I really don't give a care.
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Old 05-13-2011, 02:36 PM   #10
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back with the core 2's the memory controller was on board, which yielded FSB speeds all over the place. starting with socket 1366 the memory controller was moved on die (like amd's HT) intel calls it QPI. With socket 1366 you can still oc via the BCLK were as S.B. its all multi. supposedly i heard some where that the enthusiast S.B. are supposed to give you more freedom with the BCLK or was that Ivy Bridge
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Old 05-13-2011, 04:50 PM   #11
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Sandy-Bridge-E (Socket 2011) supposedly brings back the ability to adjust QPI, as well as a dedicated northbridge.
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