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Since I've now delved into the inner workings of overclocking a core2 I have a questions about the extremes. 1) I know unless you buy a Extreme processor the multiplier is locked but what if you went above the multiplier on a locked cpu, what would happen? Would you fry the chip or damage it? What about an Extreme processor? They say the multiplier is unlocked but how high can you go before it'll damage or not allow the cpu to work? 2) When overclocking you ultimately want your fsb:mem to be 1:1 but it doesn't seem like that is entirely possibly on a Extreme chip. Take this for example... Example 1 Multiplier @ 10 with FSB @ 1360 (340) = 3.4ghz Now with memory pc-6400 for example won't run below 400mhz so you can't get a 1:1 ratio. Example 2 Multiplier @ 13 with FSB @ 1040 (260) = 3.4ghz Again memory won't run at 260. So how do you overclock a qx6850 and get a 1:1 or is it even possible?
__________________ CSE: Lian-Li PC-A70 MOB: Biostar T-Power I45 CPU: Intel C2D E8600 @ 4.3ghz RAM: 4gb g.skill pc2-8000 GPU: XFX 8800 GT Alpha Dog Edition PSU: PC Power & Cooling 750w Heatware: My Heatware |
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__________________ CSE: Lian-Li PC-A70 MOB: Biostar T-Power I45 CPU: Intel C2D E8600 @ 4.3ghz RAM: 4gb g.skill pc2-8000 GPU: XFX 8800 GT Alpha Dog Edition PSU: PC Power & Cooling 750w Heatware: My Heatware |
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Without an extreme model you can only lower the cpu multi within the supported range. On a 6600 default is 9 and you can lower it to 7 on most mobos manually. If speedstep (aka eist) is enabled it will lower vc and multi automatically under low load to save energy and reduce heat. You want to disable eist and c1e when you overclock. EIST if enabled, will not let you adjust vc, at least not on any intel chipset mobo i have used. I have never used an nvidia chipset mobo with c2d and c2q but i thought they would let you run memory lower than 1:1 ... ie independent of fsb? Other than supporting sli, that was about the only advantage they have over intel chipsets. If you are running 6400 memory, there should not be a need to run the memory at less than 1:1. 400 fsb at 1:1 will be running 6400 memory at stock speed on intel chipsets. I assume the nvidia runs dual channel so it should be the same. Not sure how well 4gb of memory will oc beyond stock especially if it is 4x1gb sticks. All my rigs are 2 sticks of 512 or 1gb. Last edited by pscout; October 7, 2007 at 06:46 AM. |
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But one of my original questions still wasn't answered.. what happens if you were to use a multplier higher than what the cpu is rated at... would it damage it?
__________________ CSE: Lian-Li PC-A70 MOB: Biostar T-Power I45 CPU: Intel C2D E8600 @ 4.3ghz RAM: 4gb g.skill pc2-8000 GPU: XFX 8800 GT Alpha Dog Edition PSU: PC Power & Cooling 750w Heatware: My Heatware |
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That's the difference between the "uber" procs and those for us normal folks.... the highest end chips do not have their multipliers locked to prevent them from being raised, while the lower end ones only allow you to drop the multiplier downwards.
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__________________ CSE: Lian-Li PC-A70 MOB: Biostar T-Power I45 CPU: Intel C2D E8600 @ 4.3ghz RAM: 4gb g.skill pc2-8000 GPU: XFX 8800 GT Alpha Dog Edition PSU: PC Power & Cooling 750w Heatware: My Heatware |
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From what i have seen, the highest oc's from these extreme cpus is normally at a lower multi than the defaults. |
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And good to know that it would still work.
__________________ CSE: Lian-Li PC-A70 MOB: Biostar T-Power I45 CPU: Intel C2D E8600 @ 4.3ghz RAM: 4gb g.skill pc2-8000 GPU: XFX 8800 GT Alpha Dog Edition PSU: PC Power & Cooling 750w Heatware: My Heatware |
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