Zero errors with memtest86+, that's good.
Unfortunately it doesn't mean there are no RAM issues, now run Prime95 as mentioned below.
Looser timings won't hurt anything.
Go to BIOS and check the DRAM voltage, post it here.
Should be at least 1.5v. If it is still 1.55v it's ok, just leave it there.
The SPD tab from CPUZ is the manufacturers recommended settings at different DRAM Frequencies.
Your previously posted SPD, JEDEC #2 for 533 MHz is 7-7-7-20 and command rate 2T.
You can leave them at 8-8-8-20 if your happy with that, you won't see any difference in performance from 7-7-7-20.
If you want to change for testing, enter the first four timings, 7-7-7-20, manually and leave the rest in auto.
Make sure the Command rate stays at 2T.
Leave it in DC Mode: Unganged.
Run Prime95 torture test, this will test CPU and RAM. For at least one hour. CPU - Stress Test with Prime95
When you open Prime95 click 'Options' tab > Torture Test > select 'Blend', fill in number of threads to run.
Be sure to watch the CPU temps with Core Temp. Stop the test if the temps get to 60 deg C. AMD Phenom II x6 1055T Product Details Let us know the results.