请问dell 2020能换cpu吗？

你好！
这个型号的一体机是可以换CPU的，你可以换成I3 I5 的都可以
这个是H61的芯片组。下面是intel官方的数据
http://ark.intel.com/zh-cn/products/52806/Intel-BD82H61-PCH
兼容产品
兼容的处理器
Intel® Core™ i5-2300 Processor (6M Cache, up to 3.10 GHz)
Intel® Core™ i5-2400 Processor (6M Cache, up to 3.40 GHz)
Intel® Core™ i5-2400S Processor (6M Cache, up to 3.30 GHz)
Intel® Core™ i5-2500 Processor (6M Cache, up to 3.70 GHz)
Intel® Core™ i5-2500K Processor (6M Cache, up to 3.70 GHz)
Intel® Core™ i5-2500S Processor (6M Cache, up to 3.70 GHz)
Intel® Core™ i5-2500T Processor (6M Cache, up to 3.30 GHz)
Intel® Core™ i3-2100 Processor (3M Cache, 3.10 GHz)
Intel® Core™ i3-2100T Processor (3M Cache, 2.50 GHz)
Intel® Core™ i3-2102 Processor (3M Cache, 3.10 GHz)
Intel® Core™ i3-2120 Processor (3M Cache, 3.30 GHz)
Intel® Core™ i3-2120T Processor (3M Cache, 2.60 GHz)
Intel® Core™ i3-2130 Processor (3M Cache, 3.40 GHz)
Intel® Core™ i5-2310 Processor (6M Cache, up to 3.20 GHz)
Intel® Core™ i5-2320 Processor (6M Cache, up to 3.30 GHz)
Intel® Core™ i5-2390T Processor (3M Cache, up to 3.50 GHz)
Intel® Core™ i5-2405S Processor (6M Cache, up to 3.30 GHz)

Intel® Core™ i3-2105 Processor (3M Cache, 3.10 GHz)
Intel® Core™ i3-2125 Processor (3M Cache, 3.30 GHz)
Intel® Core™ i5-2450P Processor (6M Cache, up to 3.50 GHz)
Intel® Core™ i5-2380P Processor (6M Cache, up to 3.40 GHz)
Intel® Core™ i5-3330 Processor (6M Cache, up to 3.20 GHz)
Intel® Core™ i5-3330S Processor (6M Cache, up to 3.20 GHz)
Intel® Core™ i5-3450 Processor (6M Cache, up to 3.50 GHz)
Intel® Core™ i5-3450S Processor (6M Cache, up to 3.50 GHz)
Intel® Core™ i5-3475S Processor (6M Cache, up to 3.60 GHz)
Intel® Core™ i5-3550 Processor (6M Cache, up to 3.70 GHz)
Intel® Core™ i5-3550S Processor (6M Cache, up to 3.70 GHz)
Intel® Core™ i5-3570K Processor (6M Cache, up to 3.80 GHz)
Intel® Core™ i5-3570T Processor (6M Cache, up to 3.30 GHz)
Intel® Core™ i7-3770K Processor (8M Cache, up to 3.90 GHz)
Intel® Core™ i7-3770S Processor (8M Cache, up to 3.90 GHz)
Intel® Core™ i7-3770T Processor (8M Cache, up to 3.70 GHz)
Intel® Pentium® Processor G2120 (3M Cache, 3.10 GHz)
Intel® Core™ i5-2550K Processor (6M Cache, up to 3.80 GHz)
Intel® Core™ i3-3240 Processor (3M Cache, 3.40 GHz)
Intel® Core™ i3-3225 Processor (3M Cache, 3.30 GHz)
Intel® Core™ i3-3220 Processor (3M Cache, 3.30 GHz)
Intel® Core™ i3-3220T Processor (3M Cache, 2.80 GHz)
Intel® Core™ i5-3570S Processor (6M Cache, up to 3.80 GHz)
Intel® Core™ i5-3570 Processor (6M Cache, up to 3.80 GHz)
Intel® Core™ i5-3470T Processor (3M Cache, up to 3.60 GHz)
Intel® Core™ i3-3240T Processor (3M Cache, 2.90 GHz)
Intel® Core™ i5-3470S Processor (6M Cache, up to 3.60 GHz)
Intel® Core™ i5-3470 Processor (6M Cache, up to 3.60 GHz)
Intel® Core™ i3-2115C Processor (3MB Cache, 2.00 GHz)
Intel® Core™ i5-3350P Processor (6M Cache, up to 3.30 GHz)
Intel® Core™ i3-3210 Processor (3M Cache, 3.20 GHz)

Intel® Core™ i3-3250 Processor (3M Cache, 3.50 GHz)
Intel® Core™ i3-3250T Processor (3M Cache, 3.00 GHz)
Intel® Core™ i3-3245 Processor (3M Cache, 3.40 GHz)

您好，
可以的，不过更换的空间不大，您可以尝试更换相同接口的处理器。