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Processor And Ram Issue


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4 replies to this topic

#1 figgis41

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Posted 21 September 2008 - 11:20 AM

hi all,,, a mate of mine has orderd his parts for his first home build,,, just a question about fsb compatability,,, his mobo is an asus p5 which takes 1066 and 1333 fsb,,, he has orders this processor
http://www.overclockers.co.uk/showproduct....:thumbsup:%20-%20Retail
and this ram,,,
http://www.overclockers.co.uk/showproduct....OCZ2RPR10664GK),
i know the mobo will take both but will this processor with 1333 fsb and the ram at 1066fsb work together or do these both have to be at the same fsb.
here is the mobo he has got
http://www.overclockers.co.uk/showproduct....3%20Motherboard
thanks all.

Edited by figgis41, 21 September 2008 - 01:13 PM.

Figgis,,,, LUFC

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#2 smurfgod

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Posted 21 September 2008 - 02:32 PM

Think maybe your buddy made a mistake. Maybe I'm wrong, but he ordered DDR2 RAM for a DDR3 board. Unless they made it backwards compatible i see an RMA in his near future.
according to the folks http://www.bjorn3d.com/forum/showthread.php?t=20469 I was right. Condolences to your friend.

As far as the original question, i'm 85% sure that the FSB will downgrade to the RAMs speed, which shouldn't be that noticable considering the speed we're talking about here.

Edited by smurfgod, 21 September 2008 - 02:38 PM.


#3 hamluis

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Posted 21 September 2008 - 03:41 PM

<<...i'm 85% sure that the FSB will downgrade to the RAMs speed,...>>

It will...and even if it didn't do so automatically...you can manually adjust the FSB bus speed to match the RAM to achieve compatibility if stability becomes an issue.

I saw that DDR3 spec for that board and figured the worst without checking the RAM.

http://www.oempcworld.com/OEMPCworld-com/240pin.html

Louis

Edited by hamluis, 21 September 2008 - 03:43 PM.


#4 Sterling14

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Posted 21 September 2008 - 04:13 PM

Well, your first problem is if you ordered a board that uses DDR3 ram, DDR2 WON'T work with it.

About the speed though. Your ram is actually running faster than the processor (well not literally but you'll see what I mean).

Ram is DDR which means dual-data rate. so you take the speed which is 1066 and divide it into two because of it being dual. So you're ram is running at 533mhz. Now, the processor fsb runs in QDR which is quad-data rate. So you would take the fsb and divide it by four since it's quad. So 1333mhz fsb would be 333mhz. So you're ram is running at 533mhz (not DDR) and you're processor's fsb is running at 333mhz (not QDR).

So to sum it up, as long as your ram's speed divided by two is equal to or greater than the fsb of your processor divided by four than you're alright. If not, the ram might slow the processor down slightly, but it would still work.
"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943

#5 figgis41

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Posted 22 September 2008 - 02:47 PM

hi,,, thanks for that guy's,,, nice explanation that Sterling, ty,,, i phoned him and gave him the bad news as regards the mobo,,, bit lucky he came around to my house and i edited the post a couple of hours later and put the link up to his mobo when he showeed me it,,, as it all turned up this morning and he would have started putting it all together and had a fry up,,,lol
thanks again all.
Figgis,,,, LUFC




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