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I have a E6550 that i'd like to overclock, I need some help with how to do it. It's running on a Gigabyte P35-DS4 with a Freezer 7 Pro cooling the CPU. Any tips/guides? I'd like to get it to around 2.7/3ghz if possible.

Lock the PCI-e at 100MHz, disable any Spread Spectrun settings, lower the RAM speed to DDR667, then increase the CPU freq from 333MHz to 400MHz. That will put the CPU at 2.8GHz & the RAM back at DDR800 again. The CPU:DRAM freq ratio will then be at 1:1.

"Shouldn't the RAM be set to DDR2-800-that would make it 1:1, wouldn't it ?"
No. The RAM overclocks along with the CPU. If he would have kept the RAM setting at DDR2-800 (400MHz), then increased the CPU freq from 333 to 400MHz, the RAM speed would have increased to DDR2-960 (480MHz). In that case, the ratio would be 5:6, plus it's very possible that the RAM wouldn't overclock that much anyway & would have prevented the system from booting.

OK-you're assuming that the RAM speed and FSB frequency are left linked. Are you saying that you can't unlike them for the Gigabyte P35-DS4 motherboard,or that it's not a good way to overclock ? I have an Asus P5K motherboard and the E6550 as well with DDR2 800 RAM. I want to increase the FSB frequency to 400 MhZ and unlink the RAM and run it at DDR2 800 to keep the 1:1 ratio. Is it better to leave the RAM speed and FSB frequency linked ?

"Are you saying that you can't unlike [unlink?] them for the Gigabyte P35-DS4 motherboard,or that it's not a good way to overclock ?"
I didn't look at the manual for that board so I'm not sure if there's a BIOS option for link/unlink. If it's available, there's no reason not to take advantage of it...whatever it takes to maintain the 1:1 ratio.

Jam: Then you are saying that the RAM speed and FSB frequency on the Gigabyte P35-DS4 are linked at a 6:5 ratio. But how do you know that ? If the linkage is set at Auto, wouldn't many motherboards have an Auto setting of 1:1 ?

1st of all, I said 5:6, but that was based on the CPU/RAM info given by the OP.
2nd, if linkage is set to AUTO, the ratio would be determined by the CPU & RAM. For example, if a 1066MHz CPU (266MHz freq) is installed along with DDR2-800 RAM (400MHz freq) & the RAM speed is set to AUTO, the ratio would be 266:400, or 2:3. If the CPU freq is then increased to say 333MHz, the RAM freq would increase to 500MHz (333:500 = 2:3). But if the two are unlinked, the freq's can be set independent of one another...they way the can both be clocked at 333MHz, thus giving a 1:1 ratio.
The other way to do it would be to leave the linkage on AUTO, but to manually set the RAM freq match the CPU freq...then if the CPU freq is increased, the RAM freq will automatically increase in step with the CPU. Using the same example as above:
If a 1066MHz CPU (266MHz freq) is installed along with DDR2-800 RAM (400MHz freq) but the RAM speed is manually set to DDR2-533 (266MHz freq), the CPU:DRAM ratio will always stay at 1:1. If the CPU is increased to 333MHz, the RAM will be 333MHz...increase it to 366MHz, the RAM will run at 366MHz...increase it to 400MHz, the RAM will run at 400MHz, etc.

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