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Core I7 875k Build [Questions and Evaluation] - Page 2

post #11 of 14
Quote:
Originally Posted by quidproqu0 View Post
I'm building a i7-875K build also.
I will first off say that I barely know anything about RAM except lower timing is theoretically better. I have a couple questions regarding the RAMs you posted.
1) I barely know anything about volts except 1.5 V is standard. According to Newegg, G. Skill's ECO CAS7 has a voltage of 1.35. What does this reported voltage mean? According to reviews I saw, to get CAS 7 timing and 1600, they had to raise it up to 1.4-1.5V. Are there any side-effects to this increase in voltage?
2) Similarly, G. Skill's Ripjaws (blue) CAS7 has listed voltage of 1.65V, and people have achieved CAS 7 with 1.6-1.65. While these are higher voltages compared to the ECO version, they remain at the listed voltage. Is this better for being within reported parameter, or worse for being at a higher voltage in general?

I appreciate the help, and the listing of the ECO RAM.


On a slightly different topic, since you're debating on what cooling to get, what about thermal paste/ceramique/ or whatever it's called. What would be the best to use?


PS. my spec is looking to be i7-875K, ASUS P7P55D-E Pro, CM Hyper 212, XFX Radeon 5770 (on sale when I got), and CM 690 II or PC-K62 Case, Corsair HX 650W
Realistically you won't be able to tell the differences in latency in memory.

1.65v is the max for 1156. My memory runs stock @ 1.65v. Usually lower volt ram costs more. Other than that there is no difference.

Raising the voltage on the ram won't harm it as long as you don't go over 1.8v, which isn't recommended as going over 1.65v is risking damaging your mobo/cpu.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500K Gigabyte UD3P EVGA 460 gtx 1gb SC 2x4 GB Corsair Vengance 
Hard DriveOptical DriveCoolingOS
120gb Vertex 3 Max IOPS/40gb Kingston SSD/ 500g... Asus Dvd burner Ultra 120 Extreme Win 7 
MonitorKeyboardPowerCase
Samsung BX2450 Filco Mx Brown Corsair 650TX CM 690 II Advanced 
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G500 Razer Audio Technica M50s 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500K Gigabyte UD3P EVGA 460 gtx 1gb SC 2x4 GB Corsair Vengance 
Hard DriveOptical DriveCoolingOS
120gb Vertex 3 Max IOPS/40gb Kingston SSD/ 500g... Asus Dvd burner Ultra 120 Extreme Win 7 
MonitorKeyboardPowerCase
Samsung BX2450 Filco Mx Brown Corsair 650TX CM 690 II Advanced 
MouseMouse PadAudio
G500 Razer Audio Technica M50s 
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post #12 of 14
Quote:
Originally Posted by quidproqu0 View Post
1) I barely know anything about volts except 1.5 V is standard. According to Newegg, G. Skill's ECO CAS7 has a voltage of 1.35. What does this reported voltage mean? According to reviews I saw, to get CAS 7 timing and 1600, they had to raise it up to 1.4-1.5V. Are there any side-effects to this increase in voltage?
The reported voltage on RAM is basically what its manufacturer claims will run that RAM at its advertised speed and latency. Ideally, a RAM manufacturer will test every kit at its advertised specs to catch the bad kits before they reach the shelves. The ECOs have a lower reported voltage at DDR3-1600 C7 because they use an efficient Integrated Controller (IC). The side effect of that is that the ECOs should run cooler (efficient = less volts = less wasted volts resulting in heat) and with more stability than most other RAM options, but that shouldn't really matter if you buy a quality RAM kit. Also, low volt RAM kits are generally safer to OC to higher frequencies as a vRAM increase will probably be necessary to suppliment the RAM OC and the low volt kits are already below the standard. As for people having to set their ECO's volts to 1.4v, many motherboards do not support manually setting RAM voltages to 1.35v, so people must select the next best setting. Selecting the XMP profile can bypass that limitation, and some newer BIOS' will support 1.35v when the mobo's shipped BIOS does not. To answer you question directly, no--the only possible side effect to raising the ECOs to 1.4v is the ability for a slightly better OC than the advertised specs.

Quote:
Originally Posted by quidproqu0 View Post
2) Similarly, G. Skill's Ripjaws (blue) CAS7 has listed voltage of 1.65V, and people have achieved CAS 7 with 1.6-1.65. While these are higher voltages compared to the ECO version, they remain at the listed voltage. Is this better for being within reported parameter, or worse for being at a higher voltage in general?
The blue Ripjaws at C7 should be considered objectively "worse" than the ECOs based on their higher rated volts, but that voltage is still safe unless you have a really bad motherboard lol. I forget exactly which voltage setting it is (PLL?), but as long as vRAM is 0.5v within of it, the voltage should be safe. Still, this says nothing about what a RAM's specific ICs are actually capable of and how well they scale. My reading has indicated that the ECOs don't work above 1.6-1.65v where they can reach DDR3-2000, even at C7 if you're lucky, but the Ripjaws could do the same at 1.8v and still run safely at even higher voltages. I haven't read up on the Ripjaws, so I'm only speculating.

Quote:
Originally Posted by quidproqu0 View Post
On a slightly different topic, since you're debating on what cooling to get, what about thermal paste/ceramique/ or whatever it's called. What would be the best to use?
Like I said with air cooling in my earlier post, I usually defer to info from BMR. I've noticed that OCN members have their own preferences when it comes to Thermal Interface Material (TIM), but I have no idea why. I usually read people talking about getting TIM better than Arctic Silver 5 (AS5) for particularly high performance builds, but those people don't really say which TIMs are better are why. How can those members qualify their suggestions/opinions when BMR already did an 80-way TIM comparison, spanning the course of a full year or so, and AS5 had a 3-way tie for the absolute best performance??? Truth is, most TIMs perform so similarly that you should buy proven good TIM based on gram/$ rather than any one specific compound, but some auxilliary concerns can change the equation slightly (i.e., viscosity on even or uneven surfaces and curing time). You should notice a greater temperature differences if you use a high mounting pressure system (backplates) over the alternative (pushpins) as opposed to using the "best" TIM. Check up on BMR for more TIM information because their reviews are quite thorough.

I might hit up your thread later so we can keep this thread on track.
Not Enough
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-860 @ 3.7GHz Gigabyte P55A-UD4P Sapphire R9 290X Tri-X 4GB (Original) 2x2GB DDR3-1600 G. Skill Eco 
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1x512GB Transcend 370 | 1x3TB Toshiba | 1x3TB... LG 18x something... Scythe Mugen 2 Rev. B Windows 7 Professional x64 
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BenQ XL2411Z BenQ G2412HD Cooler Master Quick Fire Ultimate (Browns) XFX 750 Black Edition 
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Antec 902 Logitech G502 Steelseries 4HD Creative X-Fi Titanium 
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Not Enough
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CPUMotherboardGraphicsRAM
i7-860 @ 3.7GHz Gigabyte P55A-UD4P Sapphire R9 290X Tri-X 4GB (Original) 2x2GB DDR3-1600 G. Skill Eco 
Hard DriveOptical DriveCoolingOS
1x512GB Transcend 370 | 1x3TB Toshiba | 1x3TB... LG 18x something... Scythe Mugen 2 Rev. B Windows 7 Professional x64 
MonitorMonitorKeyboardPower
BenQ XL2411Z BenQ G2412HD Cooler Master Quick Fire Ultimate (Browns) XFX 750 Black Edition 
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Antec 902 Logitech G502 Steelseries 4HD Creative X-Fi Titanium 
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post #13 of 14
Thread Starter 
ctr2yellowbird: Thank you for the advice.

I will be ordering all of my parts today. Please let me know if I should proceed to order and provide me with your suggestions. Thanks in advance,

Updated first post
post #14 of 14
hey guys!!! new to OC and to OCN. couple days ago i purchased the following.

i7 875k (microcenter) (was aiming for 860/930 but 875k was on sale!!)
gigabyte p55a-ud3 (frys)
corsair h50 push and pull (directron)
4gb gskill ripjaws (newegg)
samsung spinpoint f3 (newegg)
xfx radeon 5750 (newegg)
case & psu cooler master

the build runs amazing!!!

ON stock 2.9.
temps on the h50 push and pull (real temp, speedfan)
idle - 18-25C (lowest was 17C when i went to eat at 2am)
full load - 48-53C (prime95 >20mins)

using smart 6 (gigabyte OC software) lowest OC setting "faster" = 3.2
idle - 22-30 (depends on the ambient temps)
full load - 50-55 (prime95 >20mins)

i tried the other smart 6 OC settings, turbo-3.5 & twin turbo-3.9, loads windows but didnt try to load test. you can say that i was scared.

i will wait for you guys to OC thru bios then i will jump in the bandwagon as soon as anyone gets a stable Overclock.
first build
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 875k Gigabyte GA P55a udr3 xfx radeon 5750 4gb gskill ribjaws 
Hard DriveOptical DriveOSMonitor
samsung spinpoint f3 500gb OEM LG windows 7 ultimate x64 LG LED 20inch 
PowerCase
coolermaster 550 coolermaster 
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first build
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 875k Gigabyte GA P55a udr3 xfx radeon 5750 4gb gskill ribjaws 
Hard DriveOptical DriveOSMonitor
samsung spinpoint f3 500gb OEM LG windows 7 ultimate x64 LG LED 20inch 
PowerCase
coolermaster 550 coolermaster 
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