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Samsung 840 256GB Pro: IOPS? Why so low?

post #1 of 26
Thread Starter 
I've been using the Samsung SSD Magician to benchmark my Samsung 840 256GB Pro, and the IOPS performance is something like 2/3 of what it's supposed to be.

The Sequential Read & Sequential Write speeds are within acceptable parameters (Read is always between 510 and 535 MB/s, and write is between 460 and 510 MB/s).

No matter what settings I choose, I get a random read IOPS performance of somewhere in the 60000-68000 range, and a random write in the range of 40000-50000. I've tried I/O sequential 64KB and sequential 128KB, I've tried Random set to 4KB and to 16KB, and I've tried the Test Range at 100MB, 200MB, and 400MB. All different samples. Those are the best numbers I get. I've installed only about 10GB worth of stuff so far (photoshop CS5, and then four or five other small programs).

System specs and setup:
Graphics - AMD 5770 1GB
Processor - Intel i7 2600k (running at stock speeds since I just reformatted & figuring things out)
Motherboard - Asus P8P67 Pro Rev B3
RAM - 8GB 4x 2GB 1600MHz DDR3
PSU - 850W Silverstone Strider Silver 80+
OS - Windows 7 64-Bit (TRIM enabled)

The SSD is plugged into the SATA 6.0GB/s Intel slot, not in a Marvell slot or a SATA 3.0GB/s slot. The second SATA 6.0GB/s slot is also being used by my 1TB storage hard drive, which is sitting idle. Three of my SATA 3.0GB/s slots are being used: one by a 750GB storage hard drive (also sits idle), and two by disc drives.

Any insight? Thanks.
    
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post #2 of 26
Is the test running with compressed or non compressed data? If it's non compressed it will read somewhat slower than what it's max rated for.
750-Devil
(20 items)
 
"Hello Kitty"
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel I5 6700k Skylake Gigabyte G1 Gaming 7 MSI Gaming R9 390 8 Gb G-Skill RipJawsV DDR4 2800 
Hard DriveHard DriveHard DriveCooling
WD Blue 1TB 64 Mb cache Samsung 840 EVO 120Gb Adata M.2 Sata 256 Gb Boot drive Corsair SP 120 Quiet x3 
CoolingCoolingCoolingOS
Corsiar AF 140 quiet x1 Corsair SP 120 Performance PWM x 3 Full CPU Loop, XSPC Raystorm - XSPC Photon 270 ... Windows 10 Enterprise 
MonitorKeyboardPowerCase
My 47 in. LG led 3d tv Couger Attack 3 Gaming Keyboard W/Cherry MX Blu... Seasonic SS-660XP 660W 80 PLUS Platinum ATX12V/... Corsair Obsidion 750D full tower case. 
MouseMouse PadAudioOther
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750-Devil
(20 items)
 
"Hello Kitty"
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel I5 6700k Skylake Gigabyte G1 Gaming 7 MSI Gaming R9 390 8 Gb G-Skill RipJawsV DDR4 2800 
Hard DriveHard DriveHard DriveCooling
WD Blue 1TB 64 Mb cache Samsung 840 EVO 120Gb Adata M.2 Sata 256 Gb Boot drive Corsair SP 120 Quiet x3 
CoolingCoolingCoolingOS
Corsiar AF 140 quiet x1 Corsair SP 120 Performance PWM x 3 Full CPU Loop, XSPC Raystorm - XSPC Photon 270 ... Windows 10 Enterprise 
MonitorKeyboardPowerCase
My 47 in. LG led 3d tv Couger Attack 3 Gaming Keyboard W/Cherry MX Blu... Seasonic SS-660XP 660W 80 PLUS Platinum ATX12V/... Corsair Obsidion 750D full tower case. 
MouseMouse PadAudioOther
Corsair M65 Pro RGB Corsair MP200 LG sound bar w/ bluetooth wireless sub woofer. Self sleeved cables w/paracord. 
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post #3 of 26
Thread Starter 
Quote:
Originally Posted by Devildog83 View Post

Is the test running with compressed or non compressed data? If it's non compressed it will read somewhat slower than what it's max rated for.

I'm not sure. This is Samsung SSD Magician: I would guess that they'd be providing benchmarks from their own software. They don't give the information as to whether or not they use a compressed or uncompressed benchmark (there's no choice when benchmarking so I'm not sure what it is). I had assumed that they would have set up their benchmark to allow for the numbers to match up to the box, but maybe they are doing a compressed benchmark.

I guess that leads me to the question: Is the Samsung SSD Magician benchmark doing uncompressed benchmarking, or compressed benchmarking? If it is uncompressed, then that brings me back to my initial confusion.
    
CPUMotherboardGraphicsRAM
Intel i7 2600k Asus P8P67 Pro Sapphire 5770 1GB 8GB 1600MHz G.Skill 
Hard DriveOptical DriveOSMonitor
1TB WD Blue SATA3 CD/DVD & Bluray Windows 7 27" BenQ 
KeyboardPowerCaseMouse
Das Professional 850W Silverstone Strider NZXT Phantom (Black) Rat 7 
Mouse Pad
Steelseries SX 
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CPUMotherboardGraphicsRAM
Intel i7 2600k Asus P8P67 Pro Sapphire 5770 1GB 8GB 1600MHz G.Skill 
Hard DriveOptical DriveOSMonitor
1TB WD Blue SATA3 CD/DVD & Bluray Windows 7 27" BenQ 
KeyboardPowerCaseMouse
Das Professional 850W Silverstone Strider NZXT Phantom (Black) Rat 7 
Mouse Pad
Steelseries SX 
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post #4 of 26
Honestly I don't know, I just read that some programs run both and that compressed is going to give you the fastest readings because the data can be writen faster.
750-Devil
(20 items)
 
"Hello Kitty"
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel I5 6700k Skylake Gigabyte G1 Gaming 7 MSI Gaming R9 390 8 Gb G-Skill RipJawsV DDR4 2800 
Hard DriveHard DriveHard DriveCooling
WD Blue 1TB 64 Mb cache Samsung 840 EVO 120Gb Adata M.2 Sata 256 Gb Boot drive Corsair SP 120 Quiet x3 
CoolingCoolingCoolingOS
Corsiar AF 140 quiet x1 Corsair SP 120 Performance PWM x 3 Full CPU Loop, XSPC Raystorm - XSPC Photon 270 ... Windows 10 Enterprise 
MonitorKeyboardPowerCase
My 47 in. LG led 3d tv Couger Attack 3 Gaming Keyboard W/Cherry MX Blu... Seasonic SS-660XP 660W 80 PLUS Platinum ATX12V/... Corsair Obsidion 750D full tower case. 
MouseMouse PadAudioOther
Corsair M65 Pro RGB Corsair MP200 LG sound bar w/ bluetooth wireless sub woofer. Self sleeved cables w/paracord. 
  hide details  
Reply
750-Devil
(20 items)
 
"Hello Kitty"
(8 items)
 
 
CPUMotherboardGraphicsRAM
Intel I5 6700k Skylake Gigabyte G1 Gaming 7 MSI Gaming R9 390 8 Gb G-Skill RipJawsV DDR4 2800 
Hard DriveHard DriveHard DriveCooling
WD Blue 1TB 64 Mb cache Samsung 840 EVO 120Gb Adata M.2 Sata 256 Gb Boot drive Corsair SP 120 Quiet x3 
CoolingCoolingCoolingOS
Corsiar AF 140 quiet x1 Corsair SP 120 Performance PWM x 3 Full CPU Loop, XSPC Raystorm - XSPC Photon 270 ... Windows 10 Enterprise 
MonitorKeyboardPowerCase
My 47 in. LG led 3d tv Couger Attack 3 Gaming Keyboard W/Cherry MX Blu... Seasonic SS-660XP 660W 80 PLUS Platinum ATX12V/... Corsair Obsidion 750D full tower case. 
MouseMouse PadAudioOther
Corsair M65 Pro RGB Corsair MP200 LG sound bar w/ bluetooth wireless sub woofer. Self sleeved cables w/paracord. 
  hide details  
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post #5 of 26
post #6 of 26
I don't pay any attention to what the Magician Software tells me in terms of benching. As Sean says as ssd can maybe tell us what is going on.
I have two 840 pro's in R0 for some testing right now. I have the array broken into two volumes with different stripes to hasten testing along.






post #7 of 26
I'm running into similar issues and having trouble figuring it out. I installed this drive in a Lenovo T520 laptop and my sequential read/writes are what they should be but the random IOPS are significantly lower. This was a fresh install of windows 7 x64 and tweaked it based on Samsung's recommendations with their magician software. I tested with their new version 4 of magician and version 3.2 with the same result. I've tried several versions of the intel RST drivers along with the microsoft one with little change. I also disabled Microsoft Security Essentials in case it was interfering in any way.

I thought it might have been a power setting with the cpu so disabled all CPU throttling but that only gave me a tiny performance boost. What am I missing? Is this a limitation of the chipset? Could Lenovo be throttling it somehow? I remember they capped sata2 at 150 on my old T61p laptop but fortunately someone release an uncapped bios.
http://forum.notebookreview.com/lenovo/459591-t61-x61-sata-ii-1-5-gb-s-cap-willing-pay-solution-8.html#post6501443


Lenovo T520
Intel® Core™ i5-2520M (2.50GHz, 3MB L3, 1333MHz FSB)
Intel QM67 Chipset
8GB DDR3
256GB 840 Pro w/ latest DXM04B0Q firmware
Edited by zfrogz - 2/24/13 at 12:17am
post #8 of 26
    
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 5GHz Asrock Z68 Extreme4 Gen3 ASUS 690 GTX  PATRIOT BE 16GB 
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CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 5GHz Asrock Z68 Extreme4 Gen3 ASUS 690 GTX  PATRIOT BE 16GB 
Hard DriveHard DriveCoolingOS
SAMSUNG 840 PRO 240GB 2xWD Green 2TB  Noctua DH14 Win 7 x64 
MonitorKeyboardPowerCase
Asus 27" Gigabyte Osmodius Corsair 850W Corsair Carbide 400R 
MouseMouse PadAudio
Razer Deathadder Black Edition XL soft TDL Studio 2, HK690, Beresford DAC 
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post #9 of 26
Quote:
Originally Posted by zfrogz View Post

I'm running into similar issues and having trouble figuring it out. I installed this drive in a Lenovo T520 laptop and my sequential read/writes are what they should be but the random IOPS are significantly lower. This was a fresh install of windows 7 x64 and tweaked it based on Samsung's recommendations with their magician software. I tested with their new version 4 of magician and version 3.2 with the same result. I've tried several versions of the intel RST drivers along with the microsoft one with little change. I also disabled Microsoft Security Essentials in case it was interfering in any way.

I thought it might have been a power setting with the cpu so disabled all CPU throttling but that only gave me a tiny performance boost. What am I missing? Is this a limitation of the chipset? Could Lenovo be throttling it somehow? I remember they capped sata2 at 150 on my old T61p laptop but fortunately someone release an uncapped bios.
http://forum.notebookreview.com/lenovo/459591-t61-x61-sata-ii-1-5-gb-s-cap-willing-pay-solution-8.html#post6501443


Lenovo T520
Intel® Core™ i5-2520M (2.50GHz, 3MB L3, 1333MHz FSB)
Intel QM67 Chipset
8GB DDR3
256GB 840 Pro w/ latest DXM04B0Q firmware
Its the laptop chipset.
post #10 of 26
Cool. I'm much happier knowing it's out of my control until I upgrade rather than something I'm missing. smile.gif
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