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EVGA 780I, QX9650 Yorkfield, Need Ram Advice (Rush)

post #1 of 23
Thread Starter 
I'm very new to this whole computer building thing, got a nice budget and I don't quite understand the details on Ram with the 5-5-5-15 and 1:1... it's all foreign to me... If someone would like to explain in normal terms what the whole #-#-#-# and 1:1 thing is that would be great... If not. Tell me whats a nice set or so of Ram for these two items... Building now, ordering as soon as I get a nice answer
post #2 of 23
Okay. It is a bit tough to explain all the RAM stuff, but let me go simple and quick. The 5-5-5-15 thing is called timing. All I would worry about is getting as low as you can. RAM is a compromise between the timing and frequency. DDR2-800 RAM runs at 400mhz. DDR2-1066 runs at 533mhz. The faster the RAM, sometimes the lower the timings, unless you get some really nice and expensive RAM. If you are looking for some really good RAM from a reputable company, I would suggest Crucial Ballistix Tracer RAM. Tracers have little LEDs on the side that look cool and show RAM usage. They only come in 1GB sticks as kits of 2 sticks per package, so if you want 4GB, you will end up using all the slots on your mobo. Crucials come in DDR2 800 at 4-4-4-12 and DDR2 1066 at 5-5-5-15. They may get higher frequencies, but the ones I mentioned should be <$100/kit. Nice, rig. Send some pix.
post #3 of 23
the 1:1 is you CPU:RAM frequency divider. You CPU runs at a Quad clock (for cycles for every clock) and you RAM runs at a double clock (2 cycles for every clock) So you take you CPU FSB and multiply by 4 to get you quadbus speed,then multiply that by the CPU multiplier to get your rated GHz speed. You ram, is doulbe, so you take the rated MHz speed, and divide by too to get the numbers that cyborg posted. The divider comes into play when you start OCing. So lets say you have an e2180 (the one i have) and some ddr2 800 ram (like mine). If you want to go from stock 2GHz, (which in my bios reads as 800 MHz) and you want to take it to 2.5 GHZ (1000MHz in my bios) and keep the ram at 800 MHz, then you would need to employ a CPU/Ram divider. For this certain application, the divider would be a 5:4 divider. That's all a divider is.
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post #4 of 23
+rep for stumped. nice explanation on dividers.
post #5 of 23
Thread Starter 
How would these work with the EVGA 780i Mobo?
Prob get 4 of them http://www.newegg.com/Product/Produc...82E16820148070
post #6 of 23
well, i've never been inside of an evga mobo bios, so i am of no help there. maybe some one else could help?
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post #7 of 23
I would NOT recommend Ballistix... I have a friend who's killed 2 sets of tracers, each in a different mobo in a month and he doesn't overclock...
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post #8 of 23
must of had bad ram from crucial...because in my really old PC...I have been using crucial in it for about 8 1/2 years now
post #9 of 23
As per eVGA's webpage max supported ram is 1066. But with OCing, you can run it at 1200 and higher. I only ran it to 1200 on my Ballistix. But I would recommend the G.Skill DDR2 1000 kit for $110. 2 ram modules puts less strain on the board's memory controller, so 2x2 is better then 4x1 on the NVIDIA chipset. Another plus to the ram is it runs at 2.0v - 2.1v. The Ballistix run at 2.2v, which has been known to cause issues with NVIDIA chipsets.

As for the ram timings. The ram at 4-4-4-12 read/writes at a rate of 4ns, where as the 5-5-5-15 timings read/write at a rate of 5ns. So you will actually get better performance with CAS 4 vs CAS5. The problem is, as you increase the memory's overal speed, the timings nedd to be loosened for stability. ie. 4-4-4-12 needs to be loosened to 5-5-5-15.

Another note about your baord, the ram can be run unlikned. So you can set it at whatever speed you want and the board will auto config a divider to run it at. Intel chipsets on the otherhand have to run specific dividers, which can prove more tricky to find a stable balance between FSB, RAM and CPU overclock.


You can find the list at eVGA's website on the support page under Motherboard Memory Support:

eVGA 780i/680i Series Memory support

*other memory modules may also work, the following are known compatible memory kits*


SLI Ready memory

Above 1066 MHz(Above PC2 8500)
Corsair TWIN2X2048-10000C5DF
Corsair TWIN2X2048-9136C5DF
Corsair TWIN2X2048-8888C4DF


1066 MHz(PC2 8500)
OCZ OCZ2N10662GK
OCZ OCZ2N10661G
Corsair TWIN2X2048-8500C5D
Corsair TWIN2X2048-8500C5
Kingston KHX8500D2K2/1G
OCZ OCZ2N1066SR2GK
OCZ OCZ2N1066SR1G
PNY D22GX85GMR


900 MHz(PC2 7200)
OCZ OCZ2N900SR2GK
OCZ OCZ2N900SR1G
OCZ OCZ2N9002GK
OCZ OCZ2N9001G


800 MHz(PC2 6400)
Corsair TWIN2X2048-6400C3DF
Corsair TWIN2X2048-6400C4D
Crucial BL2KIT12864AL804
Crucial BL12864AL804
Crucial BL2KIT12864AA804
Crucial BL2KIT6464AA804
Crucial BL12864AA804
Crucial BL6464AA804
Kingston KHX6400D2LLK2/2GN
Kingston KHX6400D2LLK2/1GN
Patriot PDC22G6400LLK
PNY D22GX64GMR-4





Standard Memory


Above 800 MHz(Above PC2 6400)
Kingston KHX9600D2D/2G
Kingston KHX9200D2/512
Kingston KHX8000D2K/2G
Kingston KHX7200D2K2/2G
Patriot PDC21G8000+XBLK
Patriot PDC21G8500 ELK
Crucial BL2KIT12864AL1005
G.SKILL F2-8000CL5D-4GBPQ
Mushkin XP2-1066


800 MHz(PC2 6400)
Mushkin XP-6400
Mushkin XP2-6400
OCZ OCZ2G8002GK
OCZ OCZ2P800R21G
OCZ OCZ2T8002GK
Corsair XMS6405v4.1
Corsair TWIN2X2048-6400
G.Skill F2-6400PHU2-2GBHZ
G.Skill F2-6400PHU2-2GBNR
G.SKILL F2-6400CL4D-2GBPK
G.SKILL F2-6400CL5D-4GBPQ
Team Xtreem PC2-6400 800MHz 3-3-3-8
Team Xtreem PC2-6400 800MHz 4-4-4-10
Patriot PDC22G6400ELK
Geil Ultra GX22GB6400UDC
Super Talent T800UX2GC4


667 MHz(PC2 5400)
Corsair VS512MB667D2
Buffalo D2V667C-1G/BJ
Patriot PDC21G5300LLK
PQI 5400 Turbo
Kingston KHZ5400D2K2/1G
Geil GX21GB5300SX
Muskin xp2 5300 2x1gb
Mushkin HP2-5300


533 MHz(PC2 4200)

Kingston KVR533D2/512R
PQI MAB412UOE 512MB DDR2 533
OCZ DDR2 OCZ2533512V



Page Updated: 12/19/2007



edit: When you get your ram, set them to unlinked (set to linked in this pic) and then set the Actual FSB (QDR), MHz to the memory's specs (it is in blue and not selectable because I have it set to Linked and synced).



Make sure to also set the proper memory voltage and timings.
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post #10 of 23
Quote:
Originally Posted by savagebunny View Post
must of had bad ram from crucial...because in my really old PC...I have been using crucial in it for about 8 1/2 years now
The problem is that the Ballistix are running at 2.2v to their micron D9 ICs which tends to degrade them over time. I bet your 8 1/2 year old ram isnt using D9 ICs.
My System
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6850K ASUS X99-AII eVGA GTX 1060 32Gb Team Vulcan DDR4 3000 Cas 15 
Hard DriveHard DriveHard DriveHard Drive
Samsung 960 EVO NVME Crucial M500 Seagate HDD Samsung F3 
CoolingOSMonitorKeyboard
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My System
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CPUMotherboardGraphicsRAM
6850K ASUS X99-AII eVGA GTX 1060 32Gb Team Vulcan DDR4 3000 Cas 15 
Hard DriveHard DriveHard DriveHard Drive
Samsung 960 EVO NVME Crucial M500 Seagate HDD Samsung F3 
CoolingOSMonitorKeyboard
H100i Windows 10 Pro 64 Samsung KU6300 40" Corsair K70 Vengeance 
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Seasonic Gold 750W Phantek Enthoo Pro M Logitech G9X 
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