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Mobile dies and desktop dies

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August 1, 2011 7:08:54 PM

do processor manufacturers use the same dies for desktop and mobile parts
i.e can lets say a 4 core sandy bridge die be used for either a mobile part(by udervolting and underclocking) or a desktop part
BTW how are mobile parts derived, that is are they undervolated underclocked etc
a b à CPUs
August 1, 2011 8:10:20 PM

dont know about newer cpus but in the days of athlon socket a/462 certain desktop motherboards could run laptop cpus

so yes those were undervolted and underclocked--used in something like a nfs-7 motherboard you could then up the voltage and overclock them
a c 96 à CPUs
August 1, 2011 11:20:00 PM

hannibal2469 said:
do processor manufacturers use the same dies for desktop and mobile parts
i.e can lets say a 4 core sandy bridge die be used for either a mobile part(by udervolting and underclocking) or a desktop part
BTW how are mobile parts derived, that is are they undervolated underclocked etc


It's a complicated answer. Back in the day, yes, manufacturers did essentially just undervolt and underclock desktop dies to make mobile parts. That's not 100% true today, though. First of all, there are now a lot of desktop dies that never make it into laptops. None of the L3-containing dies from AMD (Agena, Deneb, Thuban) ever made it into a mobile part, neither did any of the dies from Intel CPUs that went into LGA1366 (Nehalem-EP/Bloomfield, Westmere/Gulftown.) There are also laptop dies that had no analog in a desktop part, such as any of the AMD Socket S1g2 and S1g3-based mobile parts. There is some overlap between mainstream laptop and the low to midrange desktop as the general die floorplans are the same. However, the manufacturing process is likely subtly different to optimize desktop parts for higher clock speeds at the expense of a little extra power usage, and to optimize mobile parts for lower power usage at the expense of what would be overclocking headroom.
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a c 96 à CPUs
August 1, 2011 11:23:54 PM

mcnumpty23 said:
dont know about newer cpus but in the days of athlon socket a/462 certain desktop motherboards could run laptop cpus

so yes those were undervolted and underclocked--used in something like a nfs-7 motherboard you could then up the voltage and overclock them


A motherboard being able to run a certain CPU is solely a function of whether or not the CPU fits in the socket, the VRMs support the laptop CPU's required voltages, and that the chipset supports the laptop CPU. Socket A and Socket 754 were used both in mobile and desktop applications, so with the proper BIOS, you could run both mobile Turion 64s and desktop A64s in your Socket 754 motherboard. You could also run Pentium Ms in a few ASUS Socket 478 motherboards with the 478-479 socket adapter; the ASUS boards had a compatible BIOS with the Pentium M, and the Pentium M used the same AGTL FSB protocol that the P4 did, so it would with with the same chipsets.
August 2, 2011 8:05:12 AM

@MU_Engineer
thanks a lot, could you cite the source of your information
!