|Just don't buy RAM from ebay at all. Just my opinion. Plenty of reputable online vendors to choose from. |
All RAM in not created equal. The chips that are used to make a memory module vary in quality. Brand name manufacturers wholesale second quality chips. These chips end up on modules that are sold as no name brands.
Even name brand RAM can be something less than best quality. Look at the voltage requirements for any RAM you are considering. JEDEC standards for DDR3 is 1.5V.
Many modules labeled high performance will require higher voltages than that. Some, much higher. IMO this is trickery. Applying more voltage may allow chips to operate at a higher frequency than would otherwise be possible. If that is what you want you can probably do the same thing yourself by upping the voltage to standard RAM. You get what you pay for with RAM. One other thing to note. Some motherboards may not even allow the voltages required to run some of these overclocked sticks.
Listen to jams advice about the speed requirements too.
"According to JEDEC the maximum recommended voltage is 1.575 volts and should be considered the absolute maximum when memory stability is the foremost consideration, such as in servers or other mission critical devices. In addition, JEDEC states that memory modules must withstand up to 1.975 volts before incurring permanent damage, although they are not required to function correctly at that level".