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Intel Core 2 Duo DDR2 667 Problem

  • CPUs
  • DDR2
  • Core
  • Intel
  • Performance
Last response: in CPUs
January 5, 2007 9:53:18 PM

Hi. I'm getting a new PC with an Intel Core 2 Duo E6400. I'm going to use either DDR2 533mhz or 667mhz using dual channel because the FSB on the Core2s is 1066mhz. Anyway I read somewhere that if you use DDR2 667mhz you get performance problems, does anyone know why this is because I thought it would just make the memory slower to match the proccesor's FSB. I'm asking because I already have some DDR2 667mhz and was wondering if I should use it or buy the DDR2 533mhz to ensure there are no performance issues.

More about : intel core duo ddr2 667 problem

January 5, 2007 10:10:13 PM

You should have not problems if set everything manual and decrease the ram speed as you overclock - and/or increase your voltage. Physically - feel the ram - if its cool - crank up the volts!

2.1v is sweet spot for ddr800

When have alot people who build their own and they really do not know what they are doing then u read misconceptions - in fact newegg is filled with people that say asus boards do not work with ocz. Well i used 6 different types of ocz with 5 different boards and they all work!!!

When make cheap ram they test it and sort and price it - sometimes they just stick different labels on it - its all marketing!

The fact is the 10 kinds of ocz ram, using as a example 533,667,800, are probably all the same stuff - they stick 2.1v on it - if it gets hot its 533 1.8v if its fast then they make 5-5-5-15 800 into 5-4-5-15 if its really fast then call 4-4-4-15 if its even faster then call it 4-4-3-15 all these are currently for sale on newegg as i type this.

Depending on your board, unless it nvidia with dial in, you may be forced if you over clock to choose nonstandard settings. This is where u need to adjust voltage and latencies.

3-3-3-8 533mzh ocz ram runs the same as 5-4-5-15 800mhz - if change the voltage from 1.8 to 2.1 and set the latencies. By the way if you can find the 3-3-3-8 it is cheaper faster!

Anyways lets say you overclocked and you can only choose 888 and 689 (i made these up i did to trouble to calculate actual true numbers) from 334 bus. if you choose 689 then u can lower the latencies if you choose 888 - it might even run - you must raise the latencies and/or raise the voltage.

Wow i hope that helps!!!
January 5, 2007 11:33:50 PM

I read somewhere that if you use DDR2 667mhz you get performance problems, does anyone know why this is because I thought it would just make the memory slower to match the proccesor's FSB.

I have never heard of any performance problem associated with using DDR2-667 DRAM at the stock FSB speed of 266 (aka 1066).

I think what you are referring to is a benchmark (which unfortunately I can't point to :( ) which noted that if you ran the CPU at the stock FSB speed of 266MHz but ran the DDR2-667 at it's rated speed of 333MHz there was a slight performance hit.

If you run the CPU at the stock speed and maintain a 1:1 ratio then the motherboard will run the DDR2-667 memory at the (slower) 266MHz and you should not have any problems.

-john, the redundant legacy dinosaur
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January 6, 2007 1:34:27 AM

why would u run a a core2dup at 266fsb? its build for 1333 but - the chip is called E6650- so at least run it 315 fsb or so!
January 6, 2007 2:47:46 AM

I had no problems with either:
DDR2 533
DDR2 667
DDR2 800

If anyone is willing to get me some DDR2 1000 or higher to test, feel free to PM me and I will send you my P.O. Box # and other pertinent information.

January 6, 2007 3:08:55 AM

turn up your volts to 2.2-2.4 v then put the crab cooler on the memory Evercool Neon Crab

turn your latancys to 6-6-6-18 and have at 1000mhz with the 533!
January 6, 2007 4:17:31 AM

I can't. Not with this board. It's an Intel board, which doesn't really give any overclocking ablity.