PC 2700 & PC 333, what's with the numbers?

[vasanx]

hey you all.

feel like getting another 256 DDR for a smoother Painkiller experience, here's my prob. when i got my system the highest was PC 400. now there's like PC 2700.

1. what is it with this numbers anyway? i always figured the higher the better. but now i'm curious to know what does these numbers actually do for my progs?

2. and does combining a PC 333 with a PC 2700 present a potential problem? or should i just get another PC 333?

Athlon XP 2200+, MSI K7N2 Delta-L MCP2, 256 PC333 DDR, MSI NVidia GeForce FX 5200 128 bit, Realtek ALC650 6-channel audio, Maxtor 40GB.

 

[firstsage]

1. The numbers like PC2700 refer to the bandwidth of the ram. PC2700 has a band width of 2.7 GB/sec. PC2700 has a bus speed of 333mhz. PC2100 has a bandwidth of 2.1 GB/sec. It has a bus speed of 266mhz.
2. The combining of PC2700 and "PC333" is not a problem.

 

[Ned_Flanders]

as the above poster said, PCxxxx is the bandwidth of your RAM.

You're getting confused the Mhz and bandwidth. DDR333 Ram has a bandwidth of 2.7 Gigabites / second. DDR400 has a bandwidth of 3.2Gbps.

You want another stick of DDR333, which is also referred to as PC2700.

Anyway, adding RAM won't help you as much as upgrading your graphics card when it comes to gaming. Your graphics card is pretty poor

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[Crashman]

PC2700 IS DDR333, and runs at 166MHz.

166MHz is the clock speed
333MHz is the data rate (Double Data Rate means it's double the clock speed)
2700 is the bandwidth (64/8 * 166.667 * 2 = 2666MB/s)

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[haitang]

Every DDRxxx time(x) 8, equal PCxxxx.
example:
ddr333, time 8 = PC2700
ddr400, time 8 = PC3200
ddr500, time 8 = PC4000
Whatever format it listed, just Divide or Multiple by 8, then you'll get your answer.

 

[Crashman]

That shortcut only works if you have a 64-bit bus. Try using it for video RAM!

The shortcut is: Since the data rate is bitwidth (64) divided by 8 to make bytes, times the clock rate, times the transfer mode, and since the transfer mode is already multiplied is the DDR number: 64/8 * (166) * 2 => 8 * 333 = PC2700. You can see that your shortcut only works if you assume the bus width is 64-bit.

The full format allows you to calculate anything, from the 32-bit PCI bus, to the AGP8x peak transfer rate, to the QDR P4 bus.

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<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

 

[haitang]

This is the most easy way to find out which DDR will work with his mother board.

 

[PhishPhreak]

Ok, I understand the clock speed, data speed, and bandwidth. What I don't get is how the same type of RAM,

ie: One stick of 512MB DRR400 PC-3200 can have a price range of $85 - $170