As long as the cpu (or controller coprocessor etc) is socketd and has pins you should always keep it separate. The only case i found leaving cpus ON the board was telco class server (coprocessing) boards using pinless (lga) ics. Where the weight value of cpus was lower than the weight value of the telco board. But values fluctuate so keep an eye. When pinless is lower than telco leave lga chips in the board.
As far as value, ceramic full size chips (386dx -Pentium era) average between 1oz and 4 ounces) Standard size (isa) 802xx and pre dx 80386 chips are apx 3-5 chips per ounce. 40xxx and 44xxx cpus are 6-8 per ounce), that's the 8086 class cpus. Black fibre cpus are about ½-1 oz each. Green fibre chips are all over the weight scale. From ⅛ oz up to 5+ozs.
The common exceptions are sparc, sparc II, and original sparc 64, all with pins are Motorola /foreign gold cap cps and are 7-10 ozs each.
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