So what is the downside of using this rams? If it is going to damage the system, i am ready to refuse the package... Timing says CL9. Voltage: 1.5
Cheap, low-end or value-oriented memory tends to not perform as well as better quality memory, even at the same speed/frequency and timings. Lower end memory tends to not be optimized for maximum performance at it's rated speeds and timings, normally they are only guaranteed to run at their rated speed and timings, but not necessarily to run at any specific performance level.
This is somewhat because value memory tends to have no heatspreader on the memory chips, and so will tend to overheat more quickly under load than higher-quality memory sticks that do have heatspreaders on the memory chips. Though it's less of a problem these days as DDR3 runs cooler than DDR2 and the original DDR did, as they require less voltage to run (among other improvements).
Also, 1333MHz DDR3 with a CAS Latency of CL9 is pretty slow these days. DDR3-1600/PC3-12800 at CL9 or CL8 would be a better choice (Phenom II CPU's don't tend to be able to support speeds beyond 1600MHz, so there isn't much point in buying faster speeds than that to go with a Phenom II CPU (unless you plan to use it with some other CPU in the future that supports faster memory speeds)). Finding DDR3-1600 in CL's below 8 is unlikely these days, unless you buy them on the used market on ebay or a forum like this one. (That was how I found my DDR3-1600 CL7 sticks, long after manufacturers stopped producing DDR3 in tight timings.)
Oh, and yes the GIGABYTE GA-78LMT-USB3 and ASUS M5A78L-M/USB3 aren't very good motherboards. With only a 4+1 VRM section they're really only good for running CPU's with a 95W TDP at most. A 125W TDP chip
can run in a board like this, but it's going to throttle back to a slower frequency when the system is under heavier loads to keep from overheating the VRM's in the power section, and overclocking on a board like that definitely wouldn't be advisable or recommended. Or the system may simply shut down when you attempt to use it for a resource-intensive task with a 125W TDP CPU in the system (as a couple of my motherboards did when I put a heavy load on the system).
The Asus M5A99FX Pro R2.0 you purchased is a MUCH better choice as it actually has a good power section and really can support a 125W TDP chip like the Phenom II X4 965 BE.