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The following peak GPU clock speeds are found: Gen9 graphics was sold under three names, HD 5x0 (ix-6xxx), HD 6x0 (ix-7xxx), and UHD 6x0 (ix-8/9/10xxx). x10 had a 12 execution units, while x30 had 24. There are two versions, x10, found only on the Celerons and bottom Pentium model, and HD Graphics x30, found on everything else.
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Gen9 is identical across the generations, with just name changes and minor clock speed boosts (in contrast to the CPU itself, which grew more cores as well as clock speed).
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Skylake was the architecture introduced for Intel Core i3/5/7 6-series (plus Celeron G3900/3920 and Pentium G440/G4500/G4520), and barely refined till 10th generation. Intel's HD Graphics, now known as UHD Graphics consists of essentially two relevant generations for desktop CPUs:
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