PC2700 RAM?

[Nazrac]

Jeg har planer om å kjøpe nytt hovedkort ASUS A7V333 RAID som er anbefalt her på HW (under "anbefalinger"). Jeg må også kjøpe DDR RAM da jeg bare har SD-RAM i min gamle maskin. Ifb. med ASUS kortet skriver hardware.no:

 

"(...)aller helst bør du bruke PC2700-spesifisert DDR SDRAM for å få unyttet ytelsen maksimalt (PC2700 = 166 MHz DDR)"

 

Vel.. jeg snakket med en selger på flexidata og han ville ikke anbefale meg å kjøpe PC2700 RAM han sa det holdt lenge med PC2100 RAM og at forskjellen i ytelse ikke var merkbar. Synspunkter?

[Bisarre]

Ikke helt sant, det han selgeren sier...

Om du skal kjøre maskinen helt originalt, spiller det ikke så stor rolle. Men du henter plutselig masse, ved å overklokke FSB... Bare les dette:

 

One of the key features of the KT333 chipset is that it supports PC2700 (333MHz) DDR memory - a 25% improvement over the PC2100 (266MHz) DDR memory used on the previous KT266A chipset. However, when you install PC2700 memory and set the speed to 166MHz (333MHz DDR) the improvement seen is often just a few percent. The reason for this is that the processor accesses the memory through the Northbridge - but the connection between the CPU and Northbridge is only at 266MHz. Thus, whilst the memory can transfer data to the Northbridge at 333MHz, the Northbridge can only forward this to the CPU at 266MHz. As usual, it is slightly more complex than this. Although the memory can theoretically transfer data at 333MHz to the Northbridge, in practice there are a number of overheads required when accessing memory and so additional clock cycles are required to initiate the data transfer. This why the move from PC2100 to PC2700 offers a small improvement - as the overheads take a shorter time. But, once the overheads are accounted for, the actual data transfer remains limited to 266MHz by the front side bus (FSB) speed.If your CPU is overclockable, or if its multiplier is unlocked, you can try to overcome this problem by increasing the FSB to 166MHz in SoftMenuIII of the BIOS. If your CPU is unlocked, but doesn't overclock well, you can increase the FSB but decrease the CPU's multiplier, to keep the CPU speed at its rated value. You will also need to set the FSB:AGP:PCI ratio to 5:2:1 to ensure that the AGP and PCI buses are not overclocked. By doing this, you are now running your processor with a 333MHz DDR FSB and your memory also at 333MHz. You will see a dramatic increase in memory scores, as the CPU-Northbridge connection is no longer a bottleneck.

[jornt]

Er riktig det, du merker ikke stor forskjell.. Så det er like greit å bruke pengene på større eller raskere harddisk f.eks.

 

Men neste gang du skal kjøpe hovedkort/CPU kan det jo hende du får utnyttet RAM'en bedre.

 

- Jørn

[byggeren]

Ikke glem at dersom du kjøper PC2700 minne, så kan denne kjøres på mer agressive instillinger dersom denne kjøres på PC2100 hastigheter.

 

Prisdifferansen er liten, så jeg hadde ikke vært i tvil. Jeg ville kjøpt PC2700 minnebrikker.