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There are three two different major versions for HD4000:
15.xx differentiates the driver series. 15.22 is the oldest, generally we can say 15.26 is better than this because faster in most games. 15.28 is the newest, it supports some new features like OpenGL4.0 and is the first driver series designed for Windows 8. The last four digits denotes the build number of the driver.
When you navigated: Product family: Graphics --> Product line: Laptop graphics drivers --> Product name: Intel® Core™ Processors with Intel® HD Graphics. The now proposed driver version for Windows 7 (64-bit) is 126.96.36.199.2827. You followed the path to the Intel HD Graphics driver for the Ironlake based chipset's.
When to navigated to: Product family: Graphics --> Product line: Laptop graphics drivers --> Product name: 3rd Generation Intel® Core™ Processors with Intel® HD Graphics 4000/2500. The now proposed driver version for Windows 7 (64-bit) is 188.8.131.52.2761. You navigated to the Intel HD Graphics drivers for the correct drivers for your HD4000 graphics.
So you found the latest driver for 2 seperate generations of Intel HD Graphics.
When in doubt, you can always use the The Intel® Driver Update Utility . It will find the latest drivers for your chipset automatically.
Thank you ever so much!!! What you wrote answered my question(s) at 100% and brought the enlightenment I hoped to get. Thanks a lot
However an annotation: in my eyes these options (in Download-Center) - I mean the differentiation between "Intel HD Graphics" and "Intel HD Graphics 4000" - is VERY specific and especially hard to unterstand. I mean I am a "techie" and was not able to unterstand what the difference between both "Intel HD Graphics" should be. Obviously there's the necessity to offer different downloads for every CPU/GPU/APU generation. Of course that's okay... But then I would recommend to rename the "Intel HD Graphics " download-option. Cause "Intel HD Graphics " is quite a common expression. An IvyBridge iGPU is also called "Intel HD Graphics" - you understand what I mean? To make it more clear for everybody what Intel want to express by stating "Intel HD Graphics", the option in Download-Center should be called e.g. "Intel HD Graphics 1st generation" or "Intel HD Graphics 1000" or "Intel HD Graphics Ironlake/Arrandale/Westmere" or "Intel HD Graphics 900" or whatever. Just to name it "Intel HD Graphics" is in my opinion quite hard to unterstand. Now you explained it, it was clear to me at once - but without you expression..... puh ;-)
I would appreciate if one forwards my "concern" to the appropriate department!
But is it also correct what YUPS said? I mean the main version "15.22" is (due to Robert_U) the driver for the first generation of Intel's iCPUs/i-X Cores - so it should't be an (old) alternative for IvyBridge... ?! Or are both postings correct?