TDP and power efficiency of the system unit?

Question

linux

my original configuration

CPU: AMD Athlon(tm) II X3 435 Processor 128/512Kb Cache (Family:F Model:5 Stepping:2) at ~2.91GHz
Motherboard: GA-MA770-UD3
Memory: 2x kingmax ddr2-1066 1Gb + 2x Kllisre PC2-6400U 2Gb
Video: VGA compatible controller: ATI Technologies Inc RV730XT [Radeon HD 4670]
HDD: 1 Tb Seagate Desktop ST1000DM003-1ER162
HDD: 1 Tb SATA-II 300 Western Digital Caviar Blue WD10EALS-00Z
DVD-RW: HL-DT -ST DVDRAM GH22NS40
FDD:
Bluetooth: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Case: In-Win
Power: Delta GPS-500AB A rev:01F

operating system lubuntu 14.04 I
used a similar device for evaluation
.
Initially, the device showed a consumption of 110-120W, depending on the load. I write the numbers from memory, I took measurements more than a year ago.
We managed to get another AMD Athlon(tm) II X4 620e processor for testing. Expected 95 watts versus 45 watts. yes, the temperature of the cores has decreased, but the system consumption has not decreased as significantly as expected 95-45=50W savings. It turned out somewhere around 90-100W. The processor is now in the system, I can measure it more accurately next weekend.
If I upgrade to a next generation motherboard with ddr3 (I have a spare bar) will the consumption go down? In the same place and in the chipset, a different technical process and standards will be several years younger.
Or is it better to change the power supply to 80PLUS.