On 8/17/02 11:42 PM, "Dan Stewart" <[EMAIL PROTECTED]> wrote:
> Well, I finally got around to disabling my built-in 512K cache. I soldered > a short wire across the J38 jumper solder pads. Unfortunately I didn't do > any "before" benchmarking, so I don't have any real numbers to compare. > All I can say is that things do seem snappier. Launch times, scrolling, > window resizing all feel faster. > > IAC, it definitely didn't hurt anything, and was easy enough. Of course, I > *can* solder properly, and you need good technique to do it. It's 2 very > small connections very close together. A conductive pen would definitely > be easier, but I don't have one. > > Running OS 10.2 also helps! It is also defintely faster than 10.1.5 on > this machine. I have both installed and so can switch between them. I > actually need both, because 10.2's DiskCopy does not support my IDE CD/RW > for some reason, although 10.1.5's DiskCopy sees it, and Toast under either > works fine. > > Dan >At 18:09 -0400 07/24/2002, Bailey wrote: >Has anyone tried jumping the J38 pins on a SuperMac (to bypass mobo >cache ) ? I'm willing to do it, but my J700 is installed inside my desk... >If anyone has done it - I'd like to know if it improves performance or >allows OC'ing a bit more.... >I'm thinking it's a good idea, but I thought I'd ask about it. >Jeff Walther responded: >Without the position jumpered I have been able to take every CPU card I've >tested up to the CPU card's maximum. That is, I have a G3 card that flakes out >above 49 MHz, another one that goes to 58 MHz and a PPC604e card that will work >up to 62 MHz. Every S900/J700 board I've tested will work with those cards up >to those respective maximum speeds without the J38 jumper installed. That's >about ten boards at this time. >If your G3 doesn't have software to disable the 512K cache, then you may wish >to disable it with the jumper. Leaving the motherboard cache enabled when you >have a backside cache in front of it definitely causes a performance hit. It's >not as much as 10%, but it's still a hit. Dan, I am responding with an earlier post by "Bailey" about the same subject My question is: Where is the MoBo cache on the S900, What/Where is a J38 Jumper? And can anyone explain again...how to achieve that performance gain. I'm using an XLR8 card in my machine w/software "enabled". I've searched the Supermac & Unsupported X archive for postings on this subject but I still don't get it. Thank's again Listers, Phil Meza -- 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
