1 Do a fresh clean install of the OS, applications, and utilities on the new Samsung 840 Evo. Keep the 830 as a secondary drive. That is exactly what I did for my personal rig in my home office.
2. A fresh clean install of the OS, applications, and utilities is the preferred installation method. Cloning software works reasonably well but sometime glitches develop. We've had entirely too many questions in this forum section about cloning problems. In addition, Microsoft Windows has a tendency to turn into a bloated pig with a lot of old, useless, and redundant files that were never deleted. Might as well start fresh.
3. Do not keep the Samsung 830 as the primary drive. Instead make the 840 EVO the primary drive. Once the drive is installed and working properly, install the latest version of the Samsung SSD Magician. You can use it to easily tweak ssd performance and it will make appropriate changes in Microsoft Windows too. In addition, use the SSD Magician to enable "rapid mode" which uses a portion of the available motherboard's DDR3 or DDR4 memory as a "ramdisk" to improve performance a little bit.
4. If you want to do something completely different explore virtual "ramdisks". Just google for "ramdisk reviews". A lot of the reviews were published by the same web sites that publish technical reviews of pc hardware.
Whether or not you will see or "feel" any performance difference between the 830 and 840 EVO depends on what you do with your computer. Most consumers and casual gamers will not really notice any difference. It would take working with a very heavy load to notice a difference. I have a second pc with a Samsung 830 as a primary drive and an older Samsung 470, SATA 2 3Gb/s ssd as a secondary drive. To be honest I can't tell any difference between the 840 EVO in my personal pc and the 830 in my second pc. Both pc's have some of the same applications that I use. I conducted several experiments and the results were inconclusive.
The first problem with performance is that standard 2.5 inch SATA 3 6Gb/s ssd's are already bottlenecked by SATA data transmission rates. There is a practical limits as to how much data can be transferred using SATA 3. That's why Samsung cooked up their "rapid mode" technology which relies on a motherboard's DDR3 or DDR 4 memory as a virtual ramdisk. A motherboard's system memory is a lot faster than the flash memory used in ssd's.
The second problem are the synthetic benchmarks. For years I have been posting that synthetic benchmarks do not accurately reflect real world use. That is why they are referred to as synthetic benchmarks. They were specifically designed to grossly exaggerate very minor performance differences between ssd's. In addition there are settings which can be changed to alter the results. SSD companies will choose settings that will show their ssd's in the best possible light. Unfortunately, those settings and results do not match what consumers do with their computers.
Right now the ssd industry is in a period of transition. The industry is ramping up for a big change. Standard SATA 3 6Gb/s ssd's will be replaced by PCIe ssd's which will eliminate the SATA 3 data transmission bottleneck. In addition the smaller mSATA ssd's designed for use in small portable computers will be replaced by M.2 ssd's which are also PCIe ssd's. The new smaller M.2 header / connector is also showing up in new Intel based Z97 and X99 motherboards.
I maintain the ssd database listed in a sticky at the very top of the forum section. Here is the link:
http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the Samsung section and follow the links to the technical reviews of the different models.
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