Questions regarding upgrading RAM

Intel / To be filled by o.e.m.
September 15, 2009 at 11:55:00
Specs: Microsoft Windows XP Professional, P4 3.06 GHz / 512 MB
I was just thinking about upgrading my RAM from 512MB to 2GB, so I started searching the internet for some info. The info I got put me in one heck of a CONFUSION!
FSB, DRAM Frequency, Memory Speed, Clock speed, Bus Speed, SPD blablabla - what do all these mean and what factors to keep in mind when upgrading RAM? Is it better to get 512MB(DDR-400) or 1G(DDR-333)? I did read some threads on this forum but didn't really understand much.

Here's some information about my motherboard(from the manual):

Two 184-pin DDR SDRAM Dual Inline Memory
Module (DIMM) sockets.
Support for DDR 400, DDR 333, and DDR 266.
Support for up to 2 GB of system memory.

And could someone please tell me any utility that I can use to get correct information about my system? I'm currently using ASTRA32, but It's the demo version and can't generate reports.

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September 15, 2009 at 14:29:21
This really isn't the correct forum to be asking, but you could have at least listed your CPU, motherboard & RAM specs so we know what you're asking about.

If you have a P4 3.06GHz that runs at 533MHz FSB, the correct RAM choice would be DDR333 (aka PC2700) which runs at 166MHz. However, you *could* get DDR400 (aka PC3200) which runs at 200MHz & either leave it as-is, or adjust the memory settings in the BIOS to run it at 166MHz.

If you know the make/model of your motherboard, try looking here:

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September 16, 2009 at 13:38:37
I'm sorry if I've posted my question in the wrong forum. I tried to post a report generated by ASTRA32, which was supposed to contain all the info about my system but since I'm using the demo version, the report was encrypted. That's why I asked for a utility which I could use to generate a report about my system. If you know about any such utility, please let me know.

And thanks a lot for the link you posted, it gave some useful info.

Motherboard: D865GSA
Maximum Memory Capacity: 4096MB*
Currently Installed Memory: 512MB
Available Memory Slots: 3*
Total Memory Slots: 4*
Dual Channel Support: Yes
CPU Manufacturer: GenuineIntel
CPU Family: Intel(R) Pentium(R) 4 CPU 3.06GHz Model 4, Stepping 9
CPU Speed: 3057 MHz

I got the above information by scanning my system at
*The scan shows 4096, but it can't be more than 2048.
*shows 3 available memory slots, but I see only one available on my motherboard.
*shows 4 memory slots in total whereas there are 2 on the board.
Why did the scan result in wrong info?

Got this info using 'Advanced System Information Tool'

L2 Cache: 1MB
System Bus Clock: 531.8MHz
FSB Clock: 133MHz QDR
Multiplier: 23.0

System Bus Speed: 533MHz
System Memory Speed: 333MHz

In BIOS there's also an option of DRAM Frequency which is set to Auto.

Now what's the difference among:
System Bus Clock, FSB Clock, System Bus Speed?
And what's the difference between System Memory Speed and DRAM Frequency?
And does a motherboard also have bus speed?

Too many questions, but I know you can answer them - you guys are gurus! :)

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September 16, 2009 at 13:56:56
Here's your motherboard?

Crucial page for the D864GSA

Like jam said, unbuffered, non-ECC, PC2700 is the correct choice.


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September 19, 2009 at 06:05:15
Thanks for tryin to help guys. I guess 'Hardware' is the forum where I should be posting this. So you can delete this thread.

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