New iMac uses PC133 RAM?!?!?
Page from the iMac repair manual (DRAFT edition):
PC 133 in the DIMM, huh?
I wonder if you can put <a href="http://www.crucial.com/store/PartSpecs.asp?imodule=CT64M64S4W75" target="_blank">this</a> in the SODIMM, and then reset the jumpers to 6.5x133 instead of 8x100? I wonder if the bus can handle 133 MHz?
SdC
PC 133 in the DIMM, huh?
I wonder if you can put <a href="http://www.crucial.com/store/PartSpecs.asp?imodule=CT64M64S4W75" target="_blank">this</a> in the SODIMM, and then reset the jumpers to 6.5x133 instead of 8x100? I wonder if the bus can handle 133 MHz?
SdC
Comments
Also, on the 133Mhz point, its not like Apple hasn't done it before - the iBook that I am typing this on at the moment uses 100Mhz RAM, but only a system Bus or 66Mhz. I think that it is so that the RAM is well within operating limits, and to reduce heat, which must be a big concern in that tiny case.
Hope this helps,
Dave
Another thing: I thought the heat would go from the holes in the base and out of the holes in the top. But how do it pass the mother board? It doesn´t look like there are any holes in it.
<strong>What's far more worrying is that it seems to say that 768 is the largest amount of RAM that you can put in the thing - whereas everything else says 1Gb.
</strong><hr></blockquote>
You can put in 1GB but you need a computer tech to do it since users can't reach the other RAM port. Users only have access to the one open RAM slot.
<strong>Page from the iMac repair manual (DRAFT edition):
(...)
PC 133 in the DIMM, huh?
I wonder if you can put <a href="http://www.crucial.com/store/PartSpecs.asp?imodule=CT64M64S4W75" target="_blank">this</a> in the SODIMM, and then reset the jumpers to 6.5x133 instead of 8x100? I wonder if the bus can handle 133 MHz?
SdC</strong><hr></blockquote>
Previous Macs, unlike PCs, didn't have any such jumpers. IIRC, both multiplier and FSB overclocking involved soldering, and the latter would also make your system time go 33% faster.
The G4 could obviously handle 133MHz FSB, but I'm not sure about the chipset.
And concerning the mention of "PC133" - since you can't operate both slots at different frequencies, I'd guess this is either a mere typo, or because basically every 168-pin DIMMs you can buy nowadays is PC133-compliant (which makes it PC100-compliant too), but most SO-DIMMs are still PC100 only.
Bye,
RazzFazz
<a href="http://forums.macnn.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=5&t=005360" target="_blank">http://forums.macnn.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=5&t=005360</a>
SdC
<a href="http://www.ramjet.com/ItemDescr.asp?Item=IM512A" target="_blank">http://www.ramjet.com/ItemDescr.asp?Item=IM512A</a>
looks like a good price...g
but: this is Pc-100
Crucial is selling PC-133 for the G4 iMac:
<a href="http://www.crucial.com/store/listparts.asp?Mfr+Productline=Apple+iMAC&model =iMAC+%28G4-800%29&x=9&y=15" target="_blank">http://www.crucial.com/store/listparts.asp?Mfr+Productline=Apple+iMAC&model =iMAC+%28G4-800%29&x=9&y=15</a>
but for more $....should one go with PC100 or PC133...or does it matter since the system bus is only 100??? help...want to order ram soon...not sure if prices going up or down..g
[ 01-12-2002: Message edited by: thegelding ]</p>
<strong>dang ...ramjet price is for APPLE slot, not user slot...they don't seem to sell the so-dimm for the new iMac in the 512 size yet...guess i will wait for more answers as to whether the USER Slot will hold 512 or only 256....off to search apple site...g</strong><hr></blockquote>
The internal slot for the new iMac Flat Panel holds a PC133 168-pin DIMM up to 512MB. The User Accessible memory slot holds a PC100 144-pin SO-DIMM up to 512MB.
The 168-pin is same as used in the iMac DV slot loaders. The SO-DIMM is same as the ones used for the iBook Dual USB expansion slot.
Current prices for these are as follows (ramseeker low prices)
144-pin SO-DIMM 512($195), 256($65), 128($30) and 64($20)
The above 144-pin modules can be viewed/bought at <a href="http://www.boundlesstech.com/ibook.html" target="_blank">http://www.boundlesstech.com/ibook.html</a>
168-pin DIMM 512($100), 256($47), 128($23) and 64($9)
The above 168-pin modules can be viewed.bought at <a href="http://www.ramseeker.com/newimac.shtml" target="_blank">http://www.ramseeker.com/newimac.shtml</a>
Prices may vary by the time you get to the above URLs.
Regards.... Barry Sharp
Why PC133? It's not much mor expensive if at all vs PC100.
Why low-profile? Because I can't find any TIL docs that specify any height requirements.