Well, as of 2019, this config seems not the better one. Update: : My first antenna config seems according the several Apple 802.11ac upgrade threads not "right". 2.4GHz antenna, black cable on ALU, grey on PLASTIC models, J2.Bluetooth antenna, blue cable on ALU, black on PLASTIC models, J1.5Ghz antenna, white or gray cable on ALU, black on PLASTIC models, J0.(Installing a fourth antenna can be a very hard task.) Regarding the antennas it was unclear for me in which order these should be connected to the new BCM94360CSAX card. So on an iMac, there would be one antenna too little. Why I have chosen the BCM94360CSAX card? Simply answer, because it has only 3 antenna connectors! The BCM94360CD would also work but it has 4 antenna connectors. However, - regarding the hardware cost this will give a total of around $30 per 802.11ac & BT4.x upgrade. My adapter had only one "mounting jut", - at the wrong side. Note, - the washer is not needed if you buy a (compatible) adapter with two "mounting jut" (left and right). a small piece of electrical tape (for isolating one side of the washer).a 10mm to 12mm washer (to hold Apple “pseudo-NGFF” to mini PCIe adapter at its position).3x U.FL female to MHF4 male plug antenna adapter cable, approx $3.- per piece, so total $9.- on ebay.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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