This is correct. That said, on my DS3H I got my 3570K to 4.4 GHz with automatic Vcore varying between 1.20-1.27 under load. 4.5 GHz crashes right after booting Windows, don't know if it'd need some other voltage change for that to work. 4.4 is rock solid.
At least over here the cheapest D3H was around 20 more expensive than DS3H and hard to find so I didn't bother paying extra just for better overclocking settings considering the DS3H did pretty good IMO.
Thanks to Gigabyte's idiotic naming and making WAY too many models, here's a low down of some of the differences:
GA-Z77-DS3H - no manual Vcore, no SLI support, second full PCI-E slot only x4, Realtek audio
GA-Z77-D3H - same as above but manual Vcore, VIA audio, heatsink on power components
GA-Z77X-D3H - as above but SLI/Crossfire support at x8/x8
After that you just start getting more ports and whatnot. To add to confusion there's mATX and Thunderbolt models of the D3H as well. Seriously Gigabyte, fuck your "board naming committee" and fuck your excessive product range.
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