Vielleicht sind die 8GB Ram in dieser Konstillation auch einfach inkompatibel
mit deinem Board.
Ich hatte genau dasselbe Problem mit meinem Asus P5Q Deluxe - Board.
Habe 2x2GB eingebaut und alles lief.
Hatte dann noch 2 identische Riegel dazugekauft und nichts ging mehr. Hab auch alle
Slots/Reigel durchprobiert.
Bin nach langer Recherche drauf gestoßen das diese Riegel bei vollbestückig
(also 4x2GB) inkompatibel mit dem Board sind.
Hab dann direkt bei Asus angefragt und die meinten das eine 8GB-Bestückung
die mit mehr als 800MHz läuft immer Risiken hätte.
Vielleicht ist es bei dir ganz ähnlich.
Hello, i hope this thread won't be outdated so much. And first of all: Excuse my bad english, i'm german and as a famous football coach said: My english is not so good, my german is better!
I'm another XFX780i SLI owner who did not know that SLI-ready memory is not supported with 8GB. Thanks to the forum (and wikipedia who explained what "the timings" are i started to experience with the settings and reached the following point: I could use 8 GB of RAM with a frequency of 1066MHz for the memory in a absolutely stable system!
I thought about telling other users how i could reach my target and to do a kind of How-to. Now, here it is:
My system:
First of all it will be important which components i use, so that you can compare if you use a similar system and perhaps could compare the result.
CPU: Intel E8500 (reached 3.8GHZ via FSB of 1600MHz by Vcor of 1.21875V and Vfsb of 1.1V, maximum heat after 6 hours: 65°C, everything absolutely stable!)
CPU-Fan: EKL Alpenföhn "Groß Clockner" Blue Edition
Motherboard: XFX 780i SLI with nForce fan: SilenX IXP-34-12 iXtrema Pro 60x60x25mm
RAM: two packages Twin2X4096-8500C5DF, so 4 Modules (8GB) with cooling fan!
Procedure/How i went ahead:
I tried the settings with 966MHz which are mentioned in older threads and could run memtest+ without any errors. In small steps i tried to reach the 1066MHz and it worked. Next step was sharpening the timings to reach the datas given in the EPP JEDEC. I used CPU-Z to look up the JEDEC, which timings a 4GB configuration could handle und tried to use these with my system.
After now two weeks with a very stable system, running some instances of prime95 and using BOINC for stress-testing my system some days, i'm sure, that my experimental settings will work for sure. I read some threads about huge problems with the xfx motherboard and 8GB of RAM at a higher speed than 800MHz, but for my system, and i'm very proud, it works!
The Settings i'm using:
I changed the following settings in the "NVIDIA System Tool" or in the BIOS, used them both and both delivered the same result:
SLI-Ready Memory: DISABLED
FSB-Memory Clock Mode: Unlinked
MEM Frequency: 1066MHz
Memory Timing Mode: Expert
tCL: 5
tRCD: 5
tRP: 5
tRAS: 15
CMD: 2T
tRRD: Auto
tRC: 22
tWR: Auto
tWTR: Auto
tREF: Auto
Memory Voltage: 2.100V
nForce MCP: Auto <-- be careful that the value doesn't rise automaticly (standard is 1.500V), for me it works with "Auto"-setting, but could be different with other systems. My experience is: Higher voltages rise the heat output and could make the whole system unstable. So my target was NOT to rise the nForce-Voltage, works quiet good
Performance:
I'm not a hardcore gamer and so my possibilities to test the system are limited, but memtest+ says, the speed of my RAM now is above 3900MB/s, which is a respectable rise from the standard which is about 3100MB/s, if i remember correctly.
With the rise in the FSB and the CPU frequency, i could rise my framerate in GTAIV from 33 to more than 50 Frames and it now runs very well.
At last:
These values work for me, i'm not sure if the will do for another system, everyone hast to test his system by himself.
I ran a memtest after every step i rose the frequency, when there occure errors, it will not work.
Perhaps higher frequencies are possible, but not my target. I wanted to use the memory for what it is specified.
More important to me than speed is having a stable system. And i optimized it for that!
Yes, i use a overclocked CPU, but for testing the RAM, i went back to standard settings for CPU. After being sure, that the RAM will work, i raised the FSB again and could use the fast RAM with the fast CPU.
So, if anyone has questions concerning the settings, please post here, so that i probably could help. If there are some hints, please post them too. Even if i'm studying Electrical Engineering, i'm perhaps to stupid for configuring my PC and did some bad mistakes.
Hab genau die Settings übernommen immer noch freeze :/ und das bei 4 GB
Hmm weiß nicht glaub aber nicht weil ich insgesamt 4 Riegel habe und immer 2er weiße getestet habe dann wären ja alle kaputt oder 2 ..... Aber auf 800 mhz laufen sie stable.... ach wisst ihr was ich spar einfach bis die ganzen neuen Sachen rauskommen da kauf ich mir sowieso neues System und bis dahin reichen 800 Mhz
So bin mal pennen man schreibt sich morgen
Zitieren
