a compatible Apple “pseudo-NGFF” to mini PCIe adapter (it is usually named as BCM94360CD to mini PCIe adapter), approx $4.- on ebay.an Apple Broadcom BCM943602CS (BT 4.1) combo card, approx $17.- on ebay.an Apple Broadcom BCM94360CSAX combo card, approx $10.- on ebay.The original two 802.11n and the Bluetooth antennas can be reused (with adapters), - although they are of course not 802.11ac optimized. So far I can say the WiFi and Bluetooth functionality is working perfectly (and independently from each other) under Mac OS X and Windows 7 & 10. Well, I have done it, - finally! :) I have upgraded successfully a 24" iMac 7,1 and a 24" iMac 9,1 with an original 802.11ac & BT 4.0 Apple Broadcom BCM94360CSAX combo card. So these crazy expensive "upgrade kits" may be for some people a good alternative. But as already mentioned, at least soldering of one cable is required. Regarding the cost, it is possible to get also at the Unibody iMac line an 802.11ac & BT4.x upgrade for approx $30. This will be a HARD task, - especially at an Unibody iMac (with aluminum backside). Well, on the BCM94360CD it is (strongly) recommended to install a fourth antenna. The BCM94360CD has four normal U.FL connectors, so no antenna adapters are needed. However, on these card three U.FL female to MHF4 male plug antenna adapter cables (see my post) are needed. In contrast, the BCM943602CS and BCM94360CSAX runs in 3x3 MIMO mode, - they will reach on the 5 GHz band up to 1.3 Gbps. ) The BCM94360CS2 is only a 2x2 MIMO combo card (with only two antenna connectors) and is therefore NOT really suitable for upgrading an iMac! (It reaches max. It seems that I have mixed up something totally.
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