Also, note the difference between 7.8 to 7.9 is not really significant. The WEI is not a true benchmark and does not always yield consistent results.
Truer words haven't been spoken here in a long time and the above statement fits! There is NO reason to get all OCD and anal over a 1/10 point differential in the "Windows Experience Index" score or rating. Too many end-users get all freaked out over WEI. Basically it's just guide or index to roughly indicate system performance.
Digerati is correct in the fact that SATA cables are basically the same. The only difference in the cabling is whether or not they have straight or angle connectors, locking tab, round cabling versus flat cabling and so forth. Nearly all SATA cables use an AWG 30 wire (30 gauge) and the connectors have gold-plated contacts.
Now I do use DeOxit Gold Contact enhancer to maintain clean connectors, plugs, sockets and pins throughout my setup. In areas with high humidity and such, it helps to prevent dendrite and fretting corrosion, forms an anti-tarnish layer, protects against oxidation and reduces arcing, RFI and intermittent connections.
Now a company may use the marketing term: Compliant with Serial ATA III Specifications
but there is no physical difference in the cables themselves, it is the hardware interface that is the difference.