7260 is meant for Haswell chipsets while 6205 is meant for Ivy Bridge and Sandy Bridge chipsets. On some laptops, the 7260 works with those earlier chipsets but also comes with WiFi disconnections, ping spikes, not working after sleep, etc. problems. I suggest to just get the Broadcom BCM4352 802.11ac (same form factor and features such as AC 866.7 Mbps + Bluetooth 4.0) which doesn't rely as much as Intel much on chipset platform. Remember you have an option if one brand doesn't work well on your laptop.
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