At 19:53 -0700 09/01/2002, David Allen wrote: >Has Sonnett broken the 9x (G4), 10x (G3) barrier? I contacted their tech >support, but haven't heard anything back. 800 Mhz on a 50 Mhz bus is 16x or >800 Mhz on a 40 Mhz bus is 20x. > >David Allen
Sonnet announced an upgrade with the MPC7455 on board. The 7450 and 7455 are the later G4s with an on-chip 256K L2 cache, an L3 cache controller, and up to a 16X multiplier. The only 9X barrier for the G4 was that the 7405 and 7410 were built with a 9X maximum multiplier. All that's been necessary to do 16X was for someone to put the 7450 or later on an upgrade for us. Sonnet claimed the product would ship in August, but at least one list member has mentioned that they haven't seen any product yet. Let's just hope Sonnet doesn't give NewerTech a run for their money in the wishful thinking department. Anyone remember the delay on the PDS G3 upgrades for NuBus Powermacs? The G3 is in a similar position to the G4. While earlier G3s' built-in maximum multiplier was 8X or 10X, IBMs "new" PPC750FX has up to a 20X multiplier. Can you say 1 GHz on our old machines? Given that the S900 seems happy at up to 60 MHz bus speed, it might even be possilbe to do 1200 MHz. But no one has even announced an upgrade using the 750FX. The multiplier on the FX is "hot" switchable and can be controlled by registers in the CPU. This means that after the CPU is turned on, you could adjust the multiplier in the 750FX using software, assuming someone wrote a utility to do this. One of Apple's utilities would write to the register in question, but when folks started using it to over-clock the iBook (the latest iBook uses the 750FX) Apple pulled the utility and replaced it with a version that won't write to the register in question. If someone can identify the manufacturer and model number of the pin grid array and plastic matrix on the bottom of ZIF CPU modules, I'll take a hack at building a 750FX board once I finish a couple of other projects... Jeff Walther -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/supermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
