Date: Sat, 4 Jun 2005 12:57:55 -0400 From: Charles Swiger <cswiger@mac.com> To: Supote Lee <kingtutankhamen@hotmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: P4B533 vs DDR Ram 400 MHz Message-ID: <F2808FF6-7074-4CE6-A7D0-29727C6FBD0C@mac.com> In-Reply-To: <BAY2-F4D19D1520F81B29B0E655BAF90@phx.gbl> References: <BAY2-F4D19D1520F81B29B0E655BAF90@phx.gbl>
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On Jun 4, 2005, at 12:42 AM, Supote Lee wrote: > What if I using both of them together ? I mean using both > DDR-266 and DDR-400 at the same time. Can I ? Yes, if you make sure that both DIMMs accept the same voltage range. The memory should work at DDR-266 speeds, but you may need to back off the memory timings (ie, go to CAS-3) for the system to be stable. For example, I have one system which was using a 512MB PC2700 (DDR-266?) DIMM, and I added a 1GB PC3500 DIMM. It would work fine at PC2100 (DDR-233), and almost work fine at PC2700-- but would generate a memtest error every few hours. "almost" stable isn't good enough. Since the system ran faster using just the 1GB stick at full speed, rather than trying to combine both, I've moved the 512MB stick elsewhere. If you do combine memory of different speeds, be sure to test the combination out overnight using memtest or some similar utility. -- -Chuck
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