New Computer, but CPU is not fast enough...

[Hagi]

Hi,

i bought me new parts of a computer, a new motherboard, cpu and ram. So I put together everything right, and the computer works now fine.
The problem is, I bought a AMD Athlon XP 2700+, but when I start the machine, my bios sais something with 1500+.
So I checked the bios settings and thats the point I don't know about. I am not sure witch points are relevant. For now, I copied these 3 entries:

CPU Extrenal Frequency (MHz): 100 MHz (I can choose between 100,133,166 and 200).

CPU Frequency Multiple Setting: Auto (I can chosse between Auto and Menu)

CPU Frequency Multiple: 13,0x (It's grayed, but I can change it when I set the second point to "Menu")


In fact I dont wanna make anything wrong, so if someone can say what I should do, that would be very helpful.

Specs:
-AMD Athlon XP 2700+ with 333MHz FSB
-ASUS A7N8X-X Motherboard (CPU FSB Jumper set to "FSB400/333/266")
-Phoenix Bios
-I have installed all drivers that came along with the new parts


Thanks very much for your help.

By the way: I also checked the CPU speed with SiSoft Sandra and it seems like an 1500 CPU....

Hagi

[NickS]

Set the CPU External frequency to 166.
2x166.6 = 333

[Hagi]

Thanks but why is it the "half"?

I mean, on the CPU package was something standing about 333 FSB or so, but how come the bios needs the "half" value?
Its not very user friedly,.....


Thanks a lot
Hagi

[NickS]

The CPU external frequency or "Front Side Bus" (FSB) speed is what is actually generated by the clock chip. It is then divided to give clocks to PCI and AGP*. It is multiplied by the "CPU multiplier" on the CPU to give the raw CPU clock speed. It is multiplied by 2 to give the memory bus speed for DDR memory; so 333MHz means it suports DDR memory with FSB of 166.6 MHz.
It's all marketing....multiply by 8 to get the DDR bandwidth - "PC2700" meaning 2700 bytes/sec with 64bit (8 byte) data width.

*Usually. Sometimes they can be "locked" to a fixed speed to prevent overspeed when overclocking, though some early AMD CPUs did not like this.

[Denniss]

FSB333 = 166MHz in reality
FSB400 = 200MHz in reality

You'll see the same with graphics cards - 1000Mhz DDR memory clock is 500MHz in reality