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R A M Question


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6 replies to this topic

#1 rowal5555

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Posted 04 June 2007 - 02:33 AM

I recently bought a new Compaq Presario laptop and wanted to add to the supplied 512MB of RAM as it is running Vista. The manufacturers site said I needed 512MB 533MHz PC2-4200 DDR2-SDRAM DIMM. (actually SODIMM)

I spent quite a bit of time searching around and came up with a module that matched all the specs, fitted it and all is good.

My question relates to the various PC2700 PC3200 PC4200 etc. I was always under the impression that these related to the configuration of the module and therefore the number of pins and the mounting slot position. Apparently I am wrong. Research I have done since is inconclusive so I've come back to you gurus. What do the PC numbers relate to?

Thanks

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#2 oldf@rt

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Posted 04 June 2007 - 03:18 AM

The PC Number (PC1600, for example) is the Max transfer rate in MB/s.

Check this link, if you feel like some brainwork: http://en.wikipedia.org/wiki/DDR_SDRAM


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#3 rowal5555

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Posted 04 June 2007 - 04:58 AM

Thanks for that. At least I'll know what I'm talking about now. I did Google it but the Wikipedia site I looked at confused me even more.

Makes my DDR2 533 PC2-4200 look pretty good, although there is a lot faster out there now. LOL

Cheers

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#4 dc3

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Posted 04 June 2007 - 11:02 AM

This may help.

PC RATING DDR RATING CLOCK RATE

DDR2 (Double Data Rate Revision 2)

PC2-10000 = DDR2-1250 = 1250MHz
PC2-9200 = DDR2-1150 = 1150MHz
PC2-9136 = DDR2-1142 = 1142MHz
PC2-8888 = DDR2-1111 = 1111MHz
PC2-8800 = DDR2-1100 = 1100MHz
PC2-8500 = DDR2-1066 = 1066MHz
PC2-8000 = DDR2-1000 = 1000MHz
PC2-7200 = DDR2-900 = 900MHz
PC2-6400 = DDR2-800 = 800MHz
PC2-6000 = DDR2-750 = 750MHz
PC2-5400 = DDR2-675 = 675MHz*
PC2-5400 = DDR2-667 = 667MHz*
PC2-5300 = DDR2-667 = 667MHz*
PC2-4300 = DDR2-533 = 533MHz*
PC2-4200 = DDR2-533 = 533MHz*
PC2-3200 = DDR2-400 = 400MHz

*PC number varies based upon manufacturer labeling

PC RATING DDR RATING CLOCK RATE
DDR (Double Data Rate)

PC-4400 = DDR-550 = 550MHz
PC-4000 = DDR-500 = 500MHz
PC-3500 = DDR-433 = 433MHz
PC-3200 = DDR-400 = 400MHz
PC-2700 = DDR-333 = 333MHz
PC-2100 = DDR-266 = 266MHz

SDRAM (Plain)
PC RATING CLOCK RATE
PC133 = 133MHz
PC100 = 100MHz
PC66 = 66MHz (very old)

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#5 Herk

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Posted 04 June 2007 - 12:38 PM

I recently worked on a computer where the manufacturer sent the wrong RAM - same number of pins, but the speed was too high and though it was the same length the notch was in the wrong place.

#6 rowal5555

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Posted 04 June 2007 - 04:38 PM

Very informative, thank you dc3.

Herk. Yes, it can be a minefield. I told my supplier of my specs and the item I wanted, and asked him to confirm before he sent. This was the reply: "
Hi Rob,

It should be OK but I can't guarantee it and our supplier wont take back value ram unless its faulty. It is only guaranteed if you go with the Ram specified by Kingston for your model. Unfortunately I have looked on the Kingston site and they haven't tested your model but some close,

This is what Kingston Ram recommend for both HP/Compaq Presario Notebook F553US and HP/Compaq Presario Notebook F555AU

http://www.ec.kingston.com/ecom/configurat...;submit1=Search



KTH-ZD8000A/256

256MB DDR2-533 Module

KTH-ZD8000A/512

512MB DDR2-533 Module

KTH-ZD8000A/1G

1GB DDR2-533 Module

KTH-ZD8000B/256

256MB DDR2-667 Module

KTH-ZD8000B/512

512MB DDR2-667 Module

KTH-ZD8000B/1G

1GB DDR2-667 Module



Below is the web link to KTH-ZD8000A/512 Ram on our website"




My reply was: "Thanks for that Tony. HP's part no. is 443489-001. Everything about the valueram checks out in the way of being DDR2 and PC2-4200 configuration so I guess we can chance it. At that price, who cares anyway. This is the first laptop I have ever bought, but with Vista and 512MB I can't get over how slow it is compared to my new Pavilion desktop, so the extra RAM should make a bit of difference. [ It is only guaranteed if you go with the Ram specified by Kingston for your model. Unfortunately I have looked on the Kingston site and they haven't tested your model] Now come on - they can't have it both ways. LOL. Cheers"

I thought it was very funny, but everything worked out well. You can't be too careful though.

Cheers

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#7 Ryan 3000

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Posted 04 June 2007 - 08:00 PM

As a simple rule for that large chart up there, all PC #'s are the DDR # times eight and anything above 500 mhz is usually DDR2.
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