Discussing DDr3 issues Analyzing the problem Solving related questions
Discussing DDr3 issues Analyzing the problem Solving related questions
Ram sticks not running at XMP indicates they operate under standard JEDEC timings. When not using XMP, multiple DDR3 sticks can align and share identical timings and frequency. Mixing a 4GB and 8GB stick on a board with only two DIMM slots won't work without enabling flex mode.
What type of motherboard? Which processor? What kind of RAM do you want to combine? The Jedec DDR3 from 1066 to 1600 is available, though there are some 1866 versions and possibly older 800 models. You won’t find XMP support on standard DDR3 cards until after 1866, and I think XMP isn’t really useful for DDR3 when you’re overclocking—just set the voltage and primary settings and let the board handle everything else. Here are some 1333 green PCB SPCs I’ve adjusted to reach 2700, getting smooth at 2640 was easy but probably not stable at those speeds—likely due to imc/mobo or RAM limits, not the SPCs themselves. If you’re mixing speed ranges, the board will pick the lowest compatible speed. Flex mode should work fine; I’ve paired a 1GB SPC with a random 4GB stick and it worked (Giga H61M), and pairing a 1GB SPC with two 4GB sticks also succeeded (Giga P55A UD3). So flex mode is quite adaptable. If you’re worried about DDR3 speed, just get specific OEM PCBs and start overclocking—DDR3 limits become noticeable around 2400-2600, where you hit board/IMC boundaries or RAM instability. Good options include Samsung 2GBD and Hynix 2GBD chips in single-sided 2GB or double-sided 4GB sticks, which can handle speeds above 2400 with decent timing, especially for TRFC. For top performance (3000+ or 32GB), consider Hynix 4GBit MFR/BFR, though they’re rare and usually only available in 2GB dual-sided or 4GB double-sided forms. These tend to be limited by capacity and reliability.
Pentium G2130 paired with GIGABYTE GA-H61M-S1 LGA 1155 Intel H61. Dual channel setup using two slots, one holding a 4GB stick at 1333MHz. All 1333MHz sticks will share the same timings? This motherboard lacks BIOS controls, so auto is the only choice. After checking, only i3+ and Ivy Bridge support flexmode; this model uses Ivy Bridge but is an i3, likely missing flexmode. Mixing a 4GB and 8GB stick with identical timings probably won’t work correctly. You may need to use a 4GB stick instead.