• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

1333Mhz fsb?

Energize

Energize

Energize

Caporegime
Joined
12 Mar 2004
Posts
29,952
Location
England
I'm confused when I see this on cpus like the Q6600 because ram speeds don't go anywhere near DDR2 2666, how exactly does that work?
 
Intel never really did run in sync like AMD but its due to fact all Intels are quad pumped they dont really run 1333, couple old examples.

AMD runs 200mhz so x2 for DDR = 400mhz

Intel runs 100mhz quad pumped = 400mhz

" "133mhz" "533mhz"
 
Last edited:
Ah so it's the same type of way ddr memory is rated. Does this mean you would need to run two DDR667 sticks in dual channel mode to get the full bandwidth?
 
Last edited:
Nope, we didnt have dual channel mobos long ago and they will still quad pumped.
Dual channel is good though.

Hmm the spacing in the last example is messed up, it looks ok before I post, weird how site wont let me do that.
 
Last edited:
Dual channel should give you a theoretical speed boost of 100% (memory being read 128bits at a time instead of 64). In the real work the speed increase could be anything between 0 and 30% depending on what you're doing (ignoring synthetic tests).
 
enigmo said:
Dual channel should give you a theoretical speed boost of 100% (memory being read 128bits at a time instead of 64). In the real work the speed increase could be anything between 0 and 30% depending on what you're doing (ignoring synthetic tests).
Click to expand...

dual channel usually gives a performance increase of around 10%...or it used to.
 
Basically, with Intel, the FSB is quad data rate whereas memory is double data rate, so halve the effective FSB to give the ideal memory speed:

1066Mhz FSB -> DDR2-533
1333Mhz FSB -> DDR2-667

Memory speeds in excess of these figures net very little gain as you're limited by FSB bandwidth. Go for faster memory if you want to overclock the FSB, DDR2-800 is the pricing sweet-spot right now and facilitates FSBs up to 400Mhz.

BTW, the Q6600 is still 1066Mhz FSB, only the new dual-cores like the E6850 are 1333Mhz.

HTH :)
 
You must log in or register to reply here.
Back
Top Bottom