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[Official] - X58 Xeon Club - - Page 896

Poll Results: How many years have you owned your X58 - Tylersburg platofrm?

 
  • 10% (49)
    More than 1 year
  • 5% (24)
    More than 2 years
  • 8% (41)
    More than 3 years
  • 11% (53)
    More than 4 years
  • 23% (113)
    More than 5 years
  • 41% (200)
    More than 6 years
480 Total Votes  
post #8951 of 12887
Regarding tRFC...

tRFC is the time given to refresh the charge in the memory cells. Specifications normally list the time in nanoseconds and time increases with the density of the memory ICs used (the individual ICs, not just the DIMM...a 4GiB single sided DIMM is generally going to need a larger tRFC window than a 4GiB dual-sided DIMM because the former has fewer, denser, ICs). Number of cycles also increases with memory clock because more cycles fit into the same time as frequency increases, of course.

By default JEDEC spec, refresh cycle time vs. IC density:

1Gb -- 110ns
2Gb -- 160ns
4Gb -- 260ns
8Gb -- 350ns
16Gb -- 480ns
32Gb -- 640ns

Note this is per IC and the size is listed in gigabits (should be gibibits, technically).

There is usually a fair bit of wiggle room and the setting is somewhat temperature dependent. Reducing tRFC can help performance, especially with denser ICs as proportionally more time is spent refreshing, but going too low won't give the memory time to fully recharge itself and can cause serious issues.
Quote:
Originally Posted by chessmyantidrug View Post

Yes. I have two of these. I don't want to talk about how much I paid for them.

Been a long time since I've been able to bring myself to pay a premium for memory; I think I spent about $65 new on the 12GiB in my current X58 setup. I'm using may last two sticks of Samsung 'wonder RAM' and a single Crucial Ballistix Sport LP with entirely different ICs, but vaguely similar OCing capabilities.

Running DDR3-2000 9-11-11-27-T1 currently. Might push a bit higher if I feel my X5670 can do 4.3GHz 24/7 on this Prolimatech Genesis.
Edited by Blameless - 8/11/16 at 11:50pm
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post #8952 of 12887
I was young(er) and not as wise as I am now. I thought I was spending my money wisely by blowing it on memory with such tight timings. I won't make that mistake again.
post #8953 of 12887
Happen to know what ICs are on those Redlines? Could be fun to play with.
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post #8954 of 12887
This discussion has piqued my interest smile.gif

Playing with the XMP and DRAM Performance enhance settings in the BIOS gave me some radically different figures:


gaves me:


and


gives me:


Now, obvs this is a very crude "benchmark" - but there is a 500MB/s difference there.

The "fastest"result is manual entry of the first 3 values, plus command rate, then with the MoBo on Auto for the rest and DRAM Perf. Enchance set to Turbo [Extreme was faster but only a tiny tiny bit and may be unstable]

However, testing in TimeSpy showed effectively NO difference in the scores - circa 0.8% boost for the CPU result only.

Cinebench also showed no difference whatsoever. Odd, huh?

TBF I may be able to benchmark a real difference somehow, but it's clearly not a big one.

Just for the hell of it I'll try a 3600 uncore next...

PS - RAM is Crucial Ballistix 1600x88824
Edited by gofasterstripes - 8/12/16 at 1:22am
post #8955 of 12887
Actually, is there any chance we can compare Cinebench's at the same CPU settings? I score 929 at 4000MHz [Turb.: DISABLE, 2400-4000Only] with a 3200MHz uncore.

IIRC You guys are all running faster CPUs than that - can you just downclock and benchmark R15 Multicore for me? Should show the difference in the RAM and Motherboards....
post #8956 of 12887
Quote:
Originally Posted by Blameless View Post

Happen to know what ICs are on those Redlines? Could be fun to play with.
I'm not sure. I just remember this specific kit had a rather high failure rate so it wasn't available for very long. I've already played around with these quite a bit.

2OGdwFn.png
post #8957 of 12887
Setting 3600 Uncore shows a large difference in MemTest for L2 and L3 cache [where does the L2 timing come from, I wonder]




...but sod-all in TimeSpy, and a whole +15points in CB R15. 936 now, heh. Seeing as this is taking me to 1.3V on my uncore, I think I'll settle for 1.255 at 3200, lol. It certainly seems to be the sweet spot on this board. Same thing with BCLK - 200 is no worries, but >205? Forget it!
post #8958 of 12887
I was able to get BCLK up to around 220 on my Sabertooth. With a better cooling solution, I may have been able to run it there 24/7.
post #8959 of 12887
Quote:
Originally Posted by chessmyantidrug View Post

Yes. I have two of these. I don't want to talk about how much I paid for them.

If you ever end up selling those things, let me know wink.gif
     
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post #8960 of 12887
Not sure what revision but I'm almost sure those are Epida Hyper's in those Redlines @chessmyantidrug

Thanks @Blameless I got wind of the dimm (i figured the IC size too) size making a difference in the tRFC timing but never a definitive answer like that, cheers!
     
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