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[GK] Hynix: World’s First 128GB DDR4 Memory Module Announced! - Page 10

post #91 of 99
Quote:
Originally Posted by Rookie1337 View Post

Ah come on Diz...we both could think of pretty good uses especially with Linux. Just imagine turning your favorite distro into something like SLAX in that you can have persistence and run from RAM. Or imagine what you could with that much RAM and manual control of the cache or even without it just think of how much Linux loves the spare RAM for caching. So much potential. biggrin.gif

Okay you're right after thinking about it there are definitely some interesting possibilities but it's not practical for the majority of users. Yes, for power users like you and me, we could absolutely find ways to use it but for regular people it would be a total waste.
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post #92 of 99
Quote:
Originally Posted by DuckieHo View Post

Just to note..... 64GB or 128GB is a whole lot of RAM..... at what point is ECC a requirement?

At 64 GB things seems to be more or less fine still without ECC. From top of my head I believe I have had two memory related crashes over the past year. And ofc I'm not 100% certain it's the lack of ECC causing these as I'm overclocked through FSB + multi at default strap (105 MHz bus). Granted I'm using 8 GB DDR3 "valueRAM" sticks so dont know, perhaps if one would push to 16 GB sticks the probabilities would increase some more and ECC might have already noticeable effect.
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post #93 of 99
Doesn't seem like it was that long ago and we were using 4mb sticks, wow if you think about it that's 32,768 4mb sticks in one tongue.gif
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post #94 of 99
Quote:
Originally Posted by fateswarm View Post

No need for Linux. You can make a ramdisk on Windows (Softperfect is a good tool currently) and load there or rather pre-load any huge thing you need for multiple faster times than even SSDs.

Granted though, a proper OS will cache stuff anyway so, it's mainly a minor benefit for the first load or for an inefficient prefetching system.

It will need something that actively uses it to be robust. Though you can already do it with limited memory, e.g. a browser profile ramdisk.

(those browser profile folders are being written and re-written like crazy all the time lately. I suspect it's their crash-protection systems)

Indeed - a lot of RAM can somewhat mask latency of the HDD system by cashing. Even XP could do it athough it was not as efficient but all modern Linux'es, as far as I'm aware and ofc windows as well are pretty competent at pre-fetching. In my experience having a lot of RAM is approx 60-80% of the SSD speed when on HDD (after prefetch has had time to run its thing) - I was for a while with just a RAID array and 32 GB of RAM. Ofc having a real SSD help and is sensible, especially considering the price they go for nowadays. Prefetch does not help a lot when booting or doing something that it did not expect. And just for added flavor a screenshot smile.gif

The dark blue bar is RAM cache. Granted I'm cheating atm - have backup running in the background so there is a lot of disk activity. But usually after some hours Win 7 has approx 20..30 GB of prefetch data in RAM (although perhaps only 4-6 GB of it is programs, rest are relatively large datafiles I have been working with on regular basis recently).
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post #95 of 99
By the way, the management of large memory reserves can degrade the system performance for the very fact of managing a large reserve even if it's empty. That's a given. Now, I've no idea if that's negligible or not.

I might be big, it might be nothing on 128GB or more.

Does anyone know?
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post #96 of 99
Quote:
Originally Posted by Carniflex View Post

At 64 GB things seems to be more or less fine still without ECC. From top of my head I believe I have had two memory related crashes over the past year. And ofc I'm not 100% certain it's the lack of ECC causing these as I'm overclocked through FSB + multi at default strap (105 MHz bus). Granted I'm using 8 GB DDR3 "valueRAM" sticks so dont know, perhaps if one would push to 16 GB sticks the probabilities would increase some more and ECC might have already noticeable effect.
Don't forget flipped-bits may not always cause crashes. These "silent errors" are more insidious in that they can cause file corruption or miscalculations.

Quote:
Originally Posted by fateswarm View Post

By the way, the management of large memory reserves can degrade the system performance for the very fact of managing a large reserve even if it's empty. That's a given. Now, I've no idea if that's negligible or not.

I might be big, it might be nothing on 128GB or more.

Does anyone know?
What do you mean?

Modern CPUs have at least (and virtually all are at) 48-bit addressing for memory. This would support 32TB (but the implementation allows for forward compatibility up to 64-bit).
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post #97 of 99
Quote:
Originally Posted by DuckieHo View Post

Modern CPUs have at least (and virtually all are at) 48-bit addressing for memory. This would support 32TB (but the implementation allows for forward compatibility up to 64-bit).

You got to map it. You got to see it, address it, handle it. Even if it's caching something then it will be a performance impact, especially if the cached data are not accessed at all.

As I said though, I've no idea if that's negligible, it might be.

That's why I asked.
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post #98 of 99
Quote:
Originally Posted by fateswarm View Post

You got to map it. You got to see it, address it, handle it. Even if it's caching something then it will be a performance impact, especially if the cached data are not accessed at all.

As I said though, I've no idea if that's negligible, it might be.

That's why I asked.

Virtual memory already does the mapping. The addressing is already natively supported by the hardware.

What performance impact? The cache is a higher tier of the Memory Hierarchy so it's purpose is to mask lower tier's performance deficiencies.

If cache data is not being accessed often, then the cache algorithm should eventually push it out of memory (once it starts hitting thresholds).
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post #99 of 99
Quote:
Originally Posted by fateswarm View Post

By the way, the management of large memory reserves can degrade the system performance for the very fact of managing a large reserve even if it's empty. That's a given. Now, I've no idea if that's negligible or not.

I might be big, it might be nothing on 128GB or more.

Does anyone know?

I dont know. I did lose couple hundred MHz of OC when going from 16 GB to 32 GB but then again 1055T on which I was at that time did not officially support 32 GB anyway. Might be that memory controller might have needed a little more volts or might be that the sticks themselves were more unstable or anything else. Then again with 1055T I had to up the memory volts even at stock settings a little bit to POST.
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Intel Core i7 3820 X79-UP4 Gigabyte 390X G1 Club3D 7870 Eyefinity 6 
RAMHard DriveHard DriveHard Drive
64 GB Barracuda 3 TB WD Green 3 TB Crucial M4 256 GB 
Hard DriveHard DriveHard DriveCooling
Crucial M4 64 GB Barracuda 4 TB Corsair LE 480HB Sythe big shuriken rev B 
CoolingCoolingCoolingOS
Nexxos 280mm radiator DC-LT Alphacool GPX 390M04 Windows 7 Pro 64 bit 
MonitorMonitorMonitorMonitor
DELL U2311H (x3) DELL U2312HM (x2) 9.7'' 2048x1536 (x3) IPAD3 retina Asus PB287Q 4K 
KeyboardPowerCaseMouse
CM Quickfire TK (red) Corsair AX-1200i Significantly modded Jupiter .. something alumi... Logitech G700s 
Mouse Pad
3M Ergonomic 
CPUMotherboardGraphicsGraphics
Intel Core i7 3820 X79-UP4 Gigabyte 390X G1 Club3D 7870 Eyefinity 6 
RAMHard DriveHard DriveHard Drive
64 GB Barracuda 3 TB WD Green 3 TB Crucial M4 256 GB 
Hard DriveHard DriveCoolingOS
Crucial M4 64 GB Barracuda 4 TB Sythe big shuriken rev B Windows 7 Pro 64 bit 
MonitorMonitorMonitorMonitor
DELL U2311H (x3) DELL U2312HM (x2) 9.7'' 2048x1536 (x3) IPAD3 retina Asus PB287Q 4K 
KeyboardPowerCaseMouse
CM Quickfire TK (red) Corsair AX-1200i Modded Sharkoon VS-3 Logitech G700s 
Mouse Pad
3M Ergonomic 
CPUMotherboardGraphicsGraphics
Intel Core i7 3820 X79-UP4 Sapphire 7950 FleX OC XFX 6770 Eyefinity 5 
GraphicsRAMHard DriveHard Drive
Club3D 7870 Eyefinity 6 64 GB Samsung 750 GB F3 Barracuda 3 TB 
Hard DriveHard DriveHard DriveHard Drive
WD Green 3 TB Crucial M4 256 GB Crucial M4 64 GB Barracuda 4 TB 
CoolingOSMonitorMonitor
Custom loop Windows 7 Pro 64 bit DELL U2311H (x3) DELL U2312HM (x2) 
MonitorMonitorKeyboardPower
9.7'' 2048x1536 (x3) IPAD3 retina Asus PB287Q 4K CM Quickfire TK (red) Corsair AX-1200i 
CaseMouseMouse Pad
Modded Chieftec Smart WH-02B-B-OB Logitech G700s 3M Ergonomic 
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