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Which ram to buy? 533 or 667?

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September 14, 2007 3:24:03 AM

Hi. I am planning to upgrade to 2gb ram, as I have vista. I currently have a core 2duo 2ghz 4mb cache , 677FSB. I sure feel dumb when i bought the laptop, thinking that i would buy the 667 ddr2 ram that i currently have to match the FSB of 667.
So i have been reading online, that in real terms my system will not be using the full potential of the 677mhz ram. (im still unsure of the techincal words). So in reality, the speed is 166mhz x4=667 FSB

Would the 533 ram be a better match with my current system (since I have a dell insprison and cant overclock it)? The 533ram has timings of 4.4.4.12 and the 667 ram hs 5.5.5.15.(is this a big difference between numbers)?
So, would it be better to go with 533 ram then? Would it perform faster than the 667 ram? thanks

More about : ram buy 533 667

September 14, 2007 4:16:25 AM

667 fsb for a C2D sounds a bit low.
IF its correct, and u dont OC, that all important 1:1 ratio would require 333Mhz ram

Ie:
667FSB is quad pumped, so 667/4=166Mhz
Ram is double pumped, so 533/2=266Mhz

IF, IF all those assumptions are correct for a laptop, 333Mhz ram would be fine, but u prob cant get that so 533 is good too.

Dont wry too much abt timings either.
September 14, 2007 6:11:28 AM

mrmez said:
667 fsb for a C2D sounds a bit low.
IF its correct, and u dont OC, that all important 1:1 ratio would require 333Mhz ram



The OP was talking about a Core2 mobile, the initial Core2's for laptops did have a 667FSB. It's only in the desktop where Core2's start from 800MHz (Allendale) or 1066MHz (Conroe). Only the recent update to mobile Core 2's did 800MHz FSB's started to appear for the mobile.

And I would agree, get the 667 if you really want a 1:1 FSB:RAM ratio. The RAM latency is something secondary and you shouldn't worry about it.
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September 14, 2007 6:22:14 AM

The basic answer for your laptop is that any of your RAM choices are quite fast compared with the CPU's FSB, as long as you have a pair of the same size modules installed, so you are running in dual channel mode. If not running in dual channel mode, be sure to get the DDR2-667 speed, in order to keep up with the 667MHz FSB data rate.
September 14, 2007 7:54:38 AM

Thanks alot guys. Ill go with the 667, both are same price almost anyway so why not the 667. Now i can rest my mind :) .
One last Q, kingston or Corsair? Both are the same specs, so anyone better than the other for the 667 ddr2 ram? thanks again
September 14, 2007 8:17:28 AM

Sorry... dont know if im missing something, or if anyone actually read my post :/ 

Assuming the Mobile works the same as the desktop

CPU fsb is quad pumped
RAM is double pumped
Therefore to maintain a 1:1 ratio with a 667Mhz FSB u will need 333Mhz ram.

(As an 'idiots guide to Intel' your ram should always be half the speed of ur fsb if u dont OC)

667Mhz ram will achieve a 1:2 ratio (cpu:ram). Essentially the ram is working at twice the rate of the cpu. This wont make your system slower, but it wont be any faster either, it just has to wait.
September 14, 2007 10:31:05 AM

@ mrmez

I saw what you said earlier. And that did make a lot of sense. Since there is no added improvement with 667, i was mainly concerned about the ram latency as the 667 was a bit higher than the 533 in this regard. But since the difference of latency between the 667 and 533 isnt much or noticeble, and as price is almost same (533 is a tiny bit more expensive), so that is why then i guess i would go for the 667. And besides, in future maybe the 667 may come in handy with another system where i can achieve the 1:1 ratio. Thanks for your help :) .
oh um, kingston or corsair? what do you say?
September 14, 2007 5:37:31 PM

Last I heard, Corsairs are tuned more to performance than compatibility, so it should work on a lot but not all boards. And kingston's are tuned to compatibility with some minor cost to performance, so kingstons should work on 90% or more of boards with a minor performance hit. Though we are talking of the performance difference of around only 0 or 1 fps in games and 2 seconds or less gain in productivity software which is a very very small amount.

You could try the corsair first or at least check if it could possibly compatible with your laptop. If it ain't compatible, kingstons are always there to save you.
September 14, 2007 10:14:40 PM

Kingstons, even their value line, are pretty good. Corsair's premium lines are good, but they contract out their ValueSelect line to the lowest bidder, so stay away from that.
September 14, 2007 10:25:39 PM

The 667 and 533 chips have 5 and 4 CL respectivly

They're almost identical in performance because of that.
September 15, 2007 3:11:56 AM

Thanks guys, you really have been a great help, really appreciate it. Why couldnt they make computer technology simple lol.
I have been searching for kingston and corsair rams (that ship to or within australia). In corsair i can only find value select ram (which is a bit cheaper than the value line from kingston). As you mentioned Mondoman, that valueselect corsair arnt that good, so i guess i wont go for that.

In kingston, well there are for sure value line, average price of about $70(australian dollar), for 1gb 667 ddr2 ram. ->part no. KVR667D2S5-1G

There is also a dell inspiron 6400 notebook specific ram (same specs) for the price of about $130 (average). -> part no. KTD-INSP6000B/1G

Is there really a performance difference between these both, or quality difference? To me, it seems just a marketing strategy to label the same ram as dell specific ram, and thus to hike up the price.
any feedback on this? thanks alot
a b } Memory
September 15, 2007 4:38:18 AM

amnotanoobie said:
And I would agree, get the 667 if you really want a 1:1 FSB:RAM ratio. The RAM latency is something secondary and you shouldn't worry about it.


Actually the 1:1 ratio would be DDR-333. Both it and the mobile 667 bus run at 166MHz. Data rate woud be 1:1 as well, so long as the system supports dual-channel mode.
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