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<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Hi</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I didn't get the 500Mhz logic board upgrade on eBay I was after last week. However, I have spotted a 550Mhz logic board also on eBay and have a few questions if anyone can answer them.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">My PowerBook is a 400Mhz G4 with 100Mhz system bus. It came in 400Mhz and 500Mhz models and you could put the logic board from a 500Mhz into a 400Mhz and it would work.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Nine months later, Apple brought out a second range a 550Mhz and 667Mhz model. Both had gigabyte ethernet and 16mb AGP 4x graphics card (the original TiBook only had 10/100 ethernet and 8mb AGP graphics card).</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">From looking at the logic board of the 550Mhz it looks exactly the same, all the ports and connectors and casing looks the same, unless anyone knows any different. The 550Mhz featured a 100Mhz bus but the 667 had a 133Mhz bus.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">So my question is, can I put a 550Mhz logic board into my 400Mhz machine? If not why not?</div> <br><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div>Simon Royal</div><div>-- computer advice, repairs, upgrades and support, hardware and software, Mac & PC</div><div>-- <a href="http://www.simonroyal.co.uk">www.simonroyal.co.uk</a></div><div>-- the box says requires Windows 2000 or better, so I bought a Mac</div><div>-- there are 10 types of people in this world, those who understand binary and those who don't</div></span></span> </div><br></body></html>