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Laptops that come stock with integrated graphics can not normally accept dedicated graphics cards, unfortunately. In most cases, those that do come with dedicated graphics normally have them soldered to the motherboard somehow. The rest uses MXM slots to accomodate a variety of graphics cards, though this is normally reserved for mid and high end laptops. I know this is not what you wanted to hear (I know the feeling, I've been there once) but if your laptop had an MXM slot available, it would already include a dedicated graphics card.
As for the processor, the chipset itself is indeed compatible with the processors you mentioned. However, that doesn't necessarily mean the laptop comes with adequate BIOS support for these components. Your best bet would be to investigate and see if anyone has successfully managed to upgrade the processor on your laptop model, but I doubt it has been attempted (I checked and didn't find anything). I don't think the upgrade is worth attempting: you're likely to end up spending money on a brand new processor you won't be able to use, and then you'll have to see about selling it to get some of your investment back.
A Pentium processor is something I would have skipped, considering how old they are. If you don't mind me asking, what do you want to be able to do with your laptop? Depending on this, you may or may not need the upgrades. The particular model you have is intended for office use.
If you do need the upgrades, however, then I'm afraid you will have to acquire a new laptop. Most laptops aren't upgradeable, and those that are, offer varying degrees of upgradeability that don't match desktop-level upgradeability.
Thanks for your time to explain me such deeply
.
I understand, i am wishing to make risky investment, though it is helpful if succeed.
coz i want to upgrade to core processor , so that i could use it for gaming and extra tasking 12hrs a day.
now itself it was being used for educational purpose only.
You're welcome.
If you want a gaming-capable laptop that would be powerful enough for playing games on high settings, then in most cases you're looking at a 1200+ USD investment, approximately. If your budget allows you to go higher, then by all means do.
I'd go for an i7 processor. You don't need the top of the line, something such as the 3610QM will be sufficient. Since gaming is your primary concern, then you want a powerful graphics card - I would start at the high-range (with something such as a 660m from NVidia) and go as high as the budget would allow. When it comes to games, the graphics card should be your first priority.
If such a system is beyond the budget, there's quite a few good deals out there. You could settle with an i5 processor and a mid-range graphics card, and that would be a significant price drop over the previous alternative.