Samsung 30 nm ram question

[LagunaX]

http://www.techpowerup.com/forums/showthread.php?t=160687

 

[Charlie98]

Here it is stuck in my build, compared to my old G.Skill Sniper...

 

[Charlie98]

http://www.techpowerup.com/forums/showthread.php?t=160687

What is that silver film on the 3 sticks of RAM? Heatsink material??? D:

Mine doesn't have that...

 

[LagunaX]

DIY custom aluminum heatspreaders!
Click on link below!
http://www.techpowerup.com/forums/showthread.php?t=160687

 

[cmdrdredd]

So what's more important for ivy...speed or timings?

If it were 1600mhz @ 8-8-8-24 vs 2000mhz @ 10-10-10-24 what is the better route?

I had always assumed companies put heat spreaders on the memory so you could not tell what IC they used so when they bin the good overclockers you could not tell.

 

[mnguyen84]

yeah. these ram seem to be out of stock everywhere online, except for Fry's. I got them for like $46 2x4gb.

 

[LagunaX]

So what's more important for ivy...speed or timings?

If it were 1600mhz @ 8-8-8-24 vs 2000mhz @ 10-10-10-24 what is the better route?

I had always assumed companies put heat spreaders on the memory so you could not tell what IC they used so when they bin the good overclockers you could not tell.

Speed.
look here: http://www.techpowerup.com/reviews/Samsung/MV-3V4G3/6.html

 

[cmdrdredd]

Cool, gonna order two individual sticks of this for 8gb before they go out of stock.

 

[jwilliams4200]

If it were 1600mhz @ 8-8-8-24 vs 2000mhz @ 10-10-10-24 what is the better route?

Compute the CAS latency in nanoseconds:

DDR3-1600 @ 8-8-8-24

The RAM is NOT 1600MHz as you wrote. It is 1600MT/s. Since it is DDRx (double data rate), it transfers data twice per IO clock cycle, so the IO clock is 1600/2 = 800MHz.

Clock cycle = 1/800MHz = 1.25ns

CAS latency = 8 * 1.25ns = 10ns

DDR3-2000 @ 10-10-10-24 :

IO clock = 2000 / 2 = 1000MHz

clock cycle = 1/1000MHz = 1ns

CAS latency = 10 * 1ns = 10ns

So, they have the same CAS latency. Therefore, the DDR3-2000 is better, since it has the same latency, but higher bandwidth at 2000MT/s

The answer would be workload dependent if the CAS latency of the DDR3-2000 was higher than the DDR3-1600, since it would then have higher bandwidth but worse latency. Which is better would then depend on whether you are doing sequential reads from RAM or accessing a lot of random RAM locations.

But in your example, you made it easy since the latency is the same, the higher bandwidth RAM is clearly better.

 

[Soulkeeper]

Will they be releasing single 8GB sticks ?

 

[QuantumPion]

I have this ram on my asus z77-v pro in 4x4 configuration. I can lower my cas latencies down to 8-8-8-22 or lower at 1.35 V and DDR-1600 but it seems to not want to overclock any higher speed at all. I can do DDR-1866 at the stock timings and 1.35 V, but any higher clock rate regardless of voltage and the computer will not POST. It just cycles on and off infinitely until I clear the BIOS.

 

[jwilliams4200]

I have this ram on my asus z77-v pro in 4x4 configuration....It just cycles on and off infinitely until I clear the BIOS.

Can't you just hit the MEM-OK button to get back to the default RAM settings?

 

[cmdrdredd]

I have this ram on my asus z77-v pro in 4x4 configuration. I can lower my cas latencies down to 8-8-8-22 or lower at 1.35 V and DDR-1600 but it seems to not want to overclock any higher speed at all. I can do DDR-1866 at the stock timings and 1.35 V, but any higher clock rate regardless of voltage and the computer will not POST. It just cycles on and off infinitely until I clear the BIOS.

Probably due to having all 4 banks populated. Might not be much you can do about that. Maybe a future BIOS update will help.

 

[taltamir]

People are talking about saving power and money... you realize we are talking about wattage savings you could count on one hand, right?
If your PC is on 24/7 your year savings are going to be measured in cents, not dollars.

 

[QuantumPion]

Can't you just hit the MEM-OK button to get back to the default RAM settings?

Oh is that what that button is for? I guess I could try that next time hehe. Although that button might be behind my cpu cooler while the CMOS clear is at the bottom of the board.

 

[chimaxi83]

Oh is that what that button is for? I guess I could try that next time hehe. Although that button might be behind my cpu cooler while the CMOS clear is at the bottom of the board.

Button should be on the upper right corner of the board, if its in a typical case installation. Just hold it down til it starts flashing, and it'll reboot with default RAM settings.

 

[drteming]

For those who runs 4 sticks of the little sammies, what kind of speed are you getting? The best I can do is 1866 9-9-9-27 2T @ 1.425v. Got a Gigabyte Z77-UD3 and i3570K, BTW.

 

[Emo]

I settled at 1866 9-9-9-24 1T at 1.35V after running different speed and timings from 1600 to 2200.

 

[Angelus359]

People are talking about saving power and money... you realize we are talking about wattage savings you could count on one hand, right?
If your PC is on 24/7 your year savings are going to be measured in cents, not dollars.

(x watts) * 24h*365d/1000KW*.16C/KW = 1.40$ per watt 24/7 usage per year



Given that, 8 gig kit is 7$ more than the *cheapest* 8gig kit on newegg.

If it saves 5 watts, for 1 year, it saves the increased price. Given that I upgrade every 4 years, this is a *huge* change. Now I got my ram for free from a friend as a trade, which is the only reason I don't have these samsung sticks.

Also, running at lower voltage means you can undervolt motherboard components pretty damn far. I undervolted every single component on my motherboard that my bios has a setting for, on an asrock z77 pro3. If I recall correctly (I was following a guide), VTT needs to stay within 0.45 of your ram. That has limitations to itself. I couldn't get my VTT under 0.95 without going unstable, even at 1.4v on my ram (which is rated at 1.65v ddr3 1600)

Given that this also can cause a faster race to idle, it can do some considerable savings.

I'm the guy who has my ivybridge 3570k undervolted -.185 offset.

CPUz claims .8v at idle and .9224 at load, with turbo on, clocked at 3.4ghz.

Having low power *everything* really racks up. My house is also filled with a mixture of CFLs and LEDs. Recently got the house reinsulated too

Now if you don't care about your electric bill... there are some other considerations... low profile low voltage ram restricts airflow in your case less, requiring your fans to not work so hard (quieter) while simultaneously letting you use whatever the hell cooler you want. Huge coolers can save noise/power too

Undervolting your GPU is great for gaming, because you can run with a quieter computer. Admittingly, undervolting GPU+CPU saves more than ram... but my CPU is only 46w running prime95... Not sure on my GPU

 

[cmdrdredd]

Performance first, all else comes second.

 

[Zxian]

Then why don't you have Delta fans in your case to help cool your overclocks some more?

 

[kbp]

cmd -
How do you like the Catleap???
I just sprung for the Dell 2410

 

[HaX]

These are great went from g.skill eco ddr3-1600 2x 2gb to the samsung 30nm 2x 4gb sticks. I havent messed with timings yet. Samsung is currently in the development of 20nm chips... Be great to see what those are like.

 

[taltamir]

If it saves 5 watts

IIRC its less then 1 watt not 5 watts. Single digit wattage savings is only for a server with many such RAM sticks.
So yes, 1 watt is 1.40$/year for 24/7/365 operation, but my statement of savings cents not dollars per stick stands. Power savings are that slim.

 

[Marcolou]

great value got mine from the egg for $40 does 8 8 8 24 36 1t 1600 i think under 1.4v also had it working at 2133 they say the safe voltage for the low profile is 1.475 and the lesser you use the better shows up in cpuz as 1.28v ram at stock speeds
uses less wattage means lesser heat and draw from psu too.
good all around ram