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JOcean is spot on. 7040 has Intel 100 series chipset which supports all intel 6th gen core cpu, i7,i5,i3. You can even install i7-6700k and it would run, although bios does not support overclock.
User validated popular cpu for 7040
cpu hits Intel Core i7-6700 2,142x Intel Core i5-6500 1,590x Intel Core i5-6500T 339x Intel Core i5-6600 308x Intel Core i7-6700T 187x Intel Core i5-6600T 102x Intel Core i3-6100 67x Intel Core i3-6100T 35x Intel Core i5-6400 30x Intel Core i7-6700K 18x Intel Core i5-6600K 11x
JOcean
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Posted December 23rd, 2023 21:32
You can and can also go to an i7 6700. This page at Hardware Corner can help with more information.
(edited)
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop