Date: Tue, 25 Feb 1997 15:53:06 -0800 From: "Jin Guojun[ITG]" <jin@george.lbl.gov> To: matt@lkg.dec.com Cc: freebsd-hardware@freebsd.org Subject: Re: Memory speed of P6-200 (256k) Message-ID: <199702252353.PAA12462@george.lbl.gov>
next in thread | raw e-mail | index | archive | help
} At 12:48 PM 2/25/97 -0800, Jin Guojun[ITG] wrote: } >The PCI is a 64-bit wide bus. The maxmimum memory speed you can get from } >this bus is 1000000000 * 8 / 60ns = 133333333 Bytes/sec (no inteleave). } } That is wrong. The PCI is typically a 32-bit wide bus running @ up to 33Mhz. } } 4 bytes * 33Mhz = maximum of 132MB/s assuming almost perfect bursting } and no wait states. } } 64 bit PCI doubles that maximum to 265MB/s. That is the PCI bus bandwidth, not the memory bandwidth :-) PCI != MEOROY, but main memory uses PCI bus. -Jin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199702252353.PAA12462>