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PCI-E difference between GTX 680 and GTX 680 Mac Edition

Dec 6, 2020
11 (0.08/day)
System Name Nostalgia 775 Extreme
Processor Intel Core 2 Extreme QX9770
Motherboard Intel DX48BT2 Bone Trail
Cooling Cooler Master Eisberg 120L Prestige
Memory Kingston HyperX Genesis KHX1600C9D3X2K2/4GX ( 2x )
Video Card(s) Nvidia GTX 560 Ti
Storage Western Digital 250GB 7,2K SATA; Western Digital 80GB 7,2K SATA; Seagate 1TB 7,2K SATA
Display(s) Philips 231T
Case Cooler Master Elite 335U
Audio Device(s) Onboard Intel High Definition Audio STAC9274D 8-Channel (7.1)
Power Supply Cooler Master Elite Power 500W RS-500-PSAP-J3
Mouse Microsoft Sidewinder X5
Keyboard Microsoft Sidewinder X6
Software Windows 10 Home 64-bit; Paint Shop Pro X8 64-bit; Codemasters F1 2017...
I know this my be a stupid and/or silly question but, i'll ask it nonetheless.
I would like to know in depth the PCI-Express difference between GTX 680 and GTX 680 Mac Edition.
TechPowerUp states that the 'normal' GTX 680 is PCI-Express 3.0 x16 » https://www.techpowerup.com/gpu-specs/geforce-gtx-680.c342 , while the Mac Edition is PCI-Express 2.0 x16 » https://www.techpowerup.com/gpu-specs/geforce-gtx-680-mac-edition.c2323
So, what's the REAL difference here? Is it just VGA-BIOS related, or is it some other hardware change?
Thank you for reading, hope someone can shed a light about this subject.