chiragsthakur :
JDFAN.... just for an information sake i am writing the post now...doesnt mean to hurt anybody's feelings...
Just Think this way..:
1. You are the manufacturer of a processor.
2. You make a QUAD core processor..the cost behind manufacturing that single chip is say $.10... Then you find that your two cores are havn less gain..so you decide to disable those cores and then sell that QUAD as DUAL core cpu. But do remember that still the cost behind that chip was $10.. But due to defect you have to sell it for say $5. This shows that to avoid a complete loss you are still selling it for $5 and you feel happy about that you are getn the cost of manufacturing two good cores.
3. You as a manufacturer wont produce a QUAD chip ($10) and disable its two good cores and sell it for $5, when you know that it has two perfectly working cores disabled. What is the point in selling a $10 product in $5 when you know that it can be unlocked...Would you like to keep your profit amount less than cost of manufacturing?
Who would buy the real QUAD core eg.$10 ??? people would buy Dual core for $5 with motherboard(ACC) another $5 and get a system at $10.
Think about it.
Well first off the cost off the CPU chip is quite a bit higher than $10 and second they are not selling the dual and triple cores below that cost point or $5.
As a simple example lets say a wafer can be cut into 100 CPUs and using your $10 cost would cost $1000 per wafer - but of that 100 there will be say 30% that have errors in either one or 2 of the cores meaning they get 70 working Quad CPUs (actual #'s will vary but keeping it simple) so they figure out the cost of production for those 70 chips ( $1000/70 = $15) and sell each chip for say $20 ( $15 cost plus $5 profit ) giving them $1400 for the $1000 wafer and leaving 30% of the chips unused.
They then take that 30% and use them as either triple or dual core (lets say it is split 50\50 on those with a single error and those with 2 errors in seperate cores to keep it simple again) - instead of throwing those 30 out they can now make 15 triple core chips and 15 dual core chips and sell them at lets say $15 for the triple and $10 for the dual core (3\4 and 1\2 the chip for the same % price)
Doing it this way the then recoup another $375 in profit (cost was already covered by the quads !! so they make more $ by doing it this way.)
But now lets say the demand for the triple core chip is higher than the 15 they are getting from each wafer and instead they need only 55 quads, 30 Triple and 15 duals per wafer, they can either pay several million to retool the assembly line and produce a run of triple core chips to fill the shortage or they can run extra wafers and disable some of the fully functional chips to meet that shortage --- in the above for instance they could still sell the 100 chips that cost $1000 for $1700 (55x$20, 30X$15, 15x$10) meaning still making a $700 profit but less than the ideal $775 profit if all were sold as is and not disabling some good cores using the example cost - which when you consider it is a much better option than paying to retool the line and run some extra triple core CPUs to fill demand,
Of course this is much more simplified than reality but that is the main concept - since the wafer is going to produce the same number of chips whether they are making quads, triples or duals (they are all the same die size to fit in the same socket !) - so the cost is literally the same per chip but they can not sell all of those chips at the same price so will figure in the cost tiers based on the production outcomes and price each of the 3 using that info - and then as production improves and error rates decline they wind up with more high end and fewer errors but if demand is higher for the lower end they will disable functional cores to meet that demand instead of letting the sale go to their competitors or paying to retool a line to produce just lower end parts.
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