AMD-APP-SDK-v2.9-Windows-641 mirrors

[lg1500]

Hello
i uploading mirrors of AMD-APP-SDK-v2.9-Windows-641 becouse downloading on official page is very slow, and it took me 1 hours, no mirror in whole google
somone trusted can download and scan for virus
http://www.multiupload.nl/ICXIR7TNQF

[Telek]

Are these needed anymore? 

I can't seem to find a definitive answer.

I have 6 rigs running without using the SDK, but they're all running slower than expected.  Is that what I should expect without installing the SDK?