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Upgrding My Ram


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6 replies to this topic

#1 voidstuff

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Posted 11 October 2007 - 05:10 PM

Well I wanted to upgrade my ram. Actually I have 1 ram slot used of 512MB ... it is a KINGSTON KVR400X64C3A/ 512 DDR400 PC3200. I wanted to buy one exactly equal to mine. Everywhere in Internet it says that this model works at 400Mhz ... but when I use PC Wizard and Cpu-z recomended by a tutorial inside bleepingcomputer , these programs say that my ram works at 200Mhz.




The following is info from PC Wizard:


PHYSICAL MEMORY

General Information :
DIMM0 (RAS 0, RAS 1) : 512 (Double Bank)
DIMM1 : Empty
DIMM2 : Empty
DIMM3 : Empty

Information SPD EEPROM (DIMM0) :
Manufacturer : Kingston
Part Number : K
Serial Number : 922028B7
Type : DDR-SDRAM PC3200 (200 MHz) - [DDR-400]


I dont understand this.. on many pages it is said that this models works at 400 Mhz and not at 200Mhz. I need to buy the same ram that I have to have dual mem upgrade. Thanks
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#2 oldf@rt

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Posted 11 October 2007 - 08:59 PM

The CPU Z program is getting the Front Side Bus Speed, which is 200MHZ, the RAM is Dual Data Rate. Which means that it transfers data twice per clock tick, which equals 400mhz. Look at this Wikipedia article, hopefully it will give you a better idea. If you get an exact match to the ram you already have, you should have no issues.
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#3 voidstuff

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Posted 11 October 2007 - 09:48 PM

Ahh thanks... so I will buy the exact mem ram that I have.


But there is still a thing that confuses me about the FSB info, you just said

The CPU Z program is getting the Front Side Bus Speed, which is 200MHZ, the RAM is Dual Data Rate.



then why the info provided by PC Wizard and Cpu-z say for FSB frequency 133.4 and bus speed 533.5 ?


Posted Image


CHIPSET (PC wizard)

General Information :
NorthBridge : SiS 655FX
SouthBridge : PCI to ISA Bridge

NorthBridge Information :
Architecture : HUB
Manufacturer : SiS (ASUSTeK Computer Inc)
Revision : 50
FSB Frequency : 133.4 MHz
Bus Speed : 533.5 MHz (QDR)
Memory Frequency (max.) : 166.67 MHz
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#4 oldf@rt

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Posted 11 October 2007 - 11:13 PM

http://en.wikipedia.org/wiki/Pumping_(computer_systems) Your FSB is running at 133 mhz, which equals PC2100DDR, or with some PIVs was known as a quad pumped FSB. The ram is capable of timing correctly to match the processor http://www.oempcworld.com/support/fsb.htm
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#5 voidstuff

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Posted 12 October 2007 - 10:38 AM

I read and undertood a bit more of it, but what you are saying is that now my PC is not working at full ? do I have to chango something like the clock in the BIOS?
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#6 oldf@rt

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Posted 12 October 2007 - 01:33 PM

It is working the way that Intel designed the processor and SiS the chip set. The bios has auto timed everything correctly.
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#7 voidstuff

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Posted 16 October 2007 - 12:30 PM

thanks, yesterday I went to buy the same ram I had to upgrade my total ram to 1 giga. Now firefox and it's tabs wont be even a bother.
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