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DDR3 Memory: What Makes Performance Better?

Intel Setup

On the Intel side, there were basically no problems. Again, the two ADATA 2x8GB sets required a slight DRAM voltage boost (which can be expected with any mixed sets), and here, I set the Radeon DRAM up manually, and it required both a slight DRAM voltage increase and a bit of memory controller voltage (VTT) added. The other remaining sets all fired right up to spec by simply enabling XMP. I ran the 4770K at 4GHz with turbo boost on.

While there were no major problems with setting up the DRAM, when you do have problems, the approaches you can use basically mirror those used with the AMD sets of DRAM. A big difference is that when you need to adjust the memory controller voltage, Intel seems to change the term with every new chipset and, at times, uses different terms among different motherboards in the same chipset. It can be called DDRVTT, VTTCPU, CPUVTT, VCCIO, VTT and other names, and is even sometimes grouped in with the VCCSA (System Agent Voltage).

  • blackmagnum
    Since the dawn of computer memory: Faster data rates=More access latency.
    Reply
  • Damn_Rookie
    It's great to see you getting the chance to do some articles on here, Tradesman1 Jim :)
    Reply
  • PaulBags
    Interesting. I'll be coming back here several times over the next several months, as I save up for & consider options for a new computer. Good to know 2x 2 stick kits arn't nessicarily equal to a 4 stick kit, and annoying since I don't see many 4 stick kits in local online stores.

    Also good to know frequency has such a measurable impact on compression, I probably don't need fancy high freq ram but now I'm going to be more annoyed my budget won't allow it.

    Thanks for the ponderous read! :)
    Reply
  • Cryio
    This was such an eye opening read. Until now I though different ram frequencies really didn't amount to much. By those times in multitasking ? Wow.
    Reply
  • damric
    Thanks Tman. Looks like you really worked your butt off in this testing.
    Reply
  • Crashman
    15517997 said:
    Since the dawn of computer memory: Faster data rates=More access latency.
    Nope. Latency stays roughly the same while clock cycles speed up. DDR3-1333 CAS 6 and DDR3-2666 CAS 12 have the same latency in nanoseconds, the number of cycles doubles while each cycle occurs in half the time.

    Reply
  • synphul
    Pretty good review, made for a fun read. I'm still amazed at the ram incompatibility when mixing different sets. I know it exists, it's not the first time people have experienced this. I've mixed various ram just on a roll of the dice and I guess I've been lucky. The brand mixing was random. When upgrading one system from ddr2 to ddr3 I threw 2x2gb of patriot in with 2x2gb of geil evo one without issue. When upgrading one of these systems and adding ram, I added 2x4gb of team zeus at 1600mhz with 2x4gb of geil evo corsa at 1333mhz and just let the motherboard configure it and match to the lower speeds/settings. No issues with either.
    Reply
  • xFolterknechtx
    1.65V sticks on Z87/97 boards? I think the upper limit Intel mentioned in their white paper for Ivy and Haswell was something around 1.55 - 1.575V for DRAM voltage.

    Do what you want with your hardware guys, but I ll stay clear of these voltages.
    Reply
  • Pierre Olivier Vidal
    I have 2 questions for future articles.
    1 - Why do memory control sugest no higher voltage then 1.65V yet my DRAM says it can handle up to 2.4V and why would they make a DRAM capable of handling 2.4V if no memory control can push safely over 1.65V? ( I'm runing on Kingston Beast 32GB 2400MHz )
    2 - Why is there some DRAMs that are not compatible with some motherboards, what makes it compatible or not?
    Reply
  • Onus
    I would hate to risk shortening the life of an expensive Intel CPU by running more than 1.6V through its IMC. You raised it to 1.7??
    Reply