25 Degrees an operating temp you will not see.
Corsair did it not CWT,ha! Look at CWT's site about the platform.
http://www.cwt.com.tw/english/2_product/1_detail.php?ID=1158
CWT seems to be calling it 80+silver not gold.
Another little fact about how the 80+ rating goes, the OEM gives the 80+ guys a very highly cherry picked unit for them to test.
I don't disagree that 25°C is not a opertating temp that the PSU will see. But that doesn't matter, the 80+ standard says 25° so that is the standard that is used with all PSUs. The units passed 80+ Gold, period. If you don't like the fact that it was at 25° then go complain to the people who standardized the certification tests.
And the platform rating is different than the PSU rating in this case because Corsair modifies the PSU from the reference platform, so the PSU must be retested again. Some manufacturers that don't modify the reference platform any, and just reuse the reference certfication. However, Corsair modifies the platform from reference and hance must recertify their units. This is why the CX series was originally not 80+ certified, and then the V2s came out and did pass 80+. The V2s were based on the same platform as the original CX V1s, in fact almost all the components were identical, but a minor change allowed them to hit 80+.
As for cherry picked units, that does happen, but generally not with reputable companies such as Corsair. Which is obvious since the review samples all score the same or greater efficiency than they are rated for.
So the units definitely are 80+ Gold units, passing the standards set by the 80+ people, however unrealistic those standard are, those are the standards that every unit that is certified must follow. So the only reason that makes sense for why they are marketted as 80+ silver is so they don't hurt the sales of the more expensive AX series.