CPUZ reports 800 with same timings as yours. Or close to it, 9-9-9-25-2T 1.5 volt
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AMD CPU / Memory Controller Limitation
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Intel has limitations also. AMD pioneered this so there of course were issues that showed later same P4 netburst you have this happen.
Now the fact is any MC has limits on speed and the more load (dimms) the more work the MC does so lower speed is a result. Now speed is a bad word I guess. MHZ or clock cycles. THe real deal is lower latency can counter high mhz. DDR showed this when ddr2 came out and ddr2 shows this with ddr3. Throughput is latency x bandwidth. A lower latency lower mhz can be faster then higher mhz high latency. Hope that makes sense its not easy to put in words.
So while the limits are diff with intel they are there. I read "The highest official memory speed of the Core i7 is DDR3/1066." One thing I know is amd like low latency so if you choose between mhz or latency go with lower mhz and lower latency. Example there isnt much diff between this 5-5-5-15 ddr2 1066 and 4-4-4-12 ddr2 800. Look at alot of low volt ddr2 800 vs 1066 and you see timings go up.
Ill take one step slower mhz and lot lower latency over higher mhz (bandwidth) and higher latency (lag) for amd phenom II. In fact if I remember right a64 was the same. Dont forget amd proved the IPC was what counted not mhz (intel p4 amd xp). With ram the same thing throughput vs mhz.Last edited by xtreeme; 08-05-2010, 04:20 PM.
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Need tech help!
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So, after doing research for about a week,Idecided to place an order on newegg.
But then after everything went through, I noticed the Gskill ram i got was for a phenon II X6..so here is the setup i bought..
Item List: Item Number: Item Description: Quantity: Price:
N82E16820231371 MEM 2Gx2|GSKILL F3-16000CL9D-4GBFLS 1 159.99
N82E16819103808 CPU AMD|PH II X4 955 AM3 RT 1 154.99
N82E16813131644 MB ASUS| CROSSHAIR IV FORMULA 890FX 1 229.99
Now i wonder..Is the computer even going to boot?
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Originally posted by GuitarPlayer View PostCan u lead me along the tweaks to get it on 2000mhz?I ve got it on 1800 stable now..I have set the latency at 9.9.9.24, dram command rate=2T ..ram voltave is at 1.65, Cpu/NB ive set to 1.25, Cpu is now clocked @3150.AMD 1090T BE @ 4050Mhz 1.375vcore, Gigabyte GA-890FXA-UD5 F3 BIOS, GSkill Flare 2x2Gb 1.65v F3-16000CL7D-4GBFLS 7-9-7-24-1T @ 2000Mhz, GSkill Phoenix Pro 120Gb SSD, 2 x Gigabyte HD6870 xfired.
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After six weeks of frustration I find this thread!
I've got a Gigabyte GA-785GMT-USB3 board with a Phenom II X6 1055T processor, and some F3-12800CL9D-4GBNQ (2GB x 2) DDR3 in it, and for the life of me I cannot get it stable. Gigabyte haven't been any help.
Could someone please walk this old n00b step-by-step through what (with detailed 'where') I'm supposed to change in the BIOS to make this combination of bits stable? The answers I've seen so far here (and in this thread) don't make enough sense.
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From AMD's own perfomance tuning guide "Dragon' System (Note, this is for black edition chips only and please pay attention to AMD's disclaimer), found at:
http://sites.amd.com/us/Documents/AM...ning_Guide.pdf
CPU NorthBridge Performance Tuning
The CPU NorthBridge (CPU NB) clock speed determines the efficiency and bandwidth capacity of the Memory
controller. L3 cache runs at this frequency as well. CPU NB performance tuning gives a measurable boost for
overall system performance. In particular it can reduce the Memory latency and improve L3 cache bandwidth
and latency. In some scenarios the CPU NB should be tuned in order to take the full advantage of overclocked
Memory frequency and bandwidth. In general the CPU NB clock should be at least three times the Memory
clock (example in case of DDR3-1600: 3 x 800MHz = 2400MHz NB clock).
PLEASE NOTE THAT THE AMD PRODUCT WARRANTY DOES NOT COVER DAMAGES CAUSED
BY RUNNING COMPONENTS OUTSIDE OF SPECIFICATION INCLUDING DAMAGES CAUSED BY
OVERCLOCKING (EVEN WHEN OVERCLOCKING IS ENABLED WITH THE AMD OVERDRIVE
UTILITY).
Again, this is only for black edition chips and be aware , changing voltages/frequencies is as such, not officially warrantied by AMD.
Hope this helps some issues.
ADDENDUM: Important!
Please be aware that cheaper motherboards , but even generally, the northbridge holds quite high temperatures, especially when stock cooling and stock thermal insulation material is used. Most users will not be aware of this and thus can be in danger of damaging or losing warranty on compinents due to NB alterations. This is why , one should stick to 1333 sticks (I did) to systems unless you really know the *how's* and *why's* for getting 1600 MHz ram. Please keep this in mind.Last edited by solar; 01-09-2011, 12:25 AM.
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There is a difference between the cpu-nb and the motherboard nb. Which are you talking about?
It seems (from your post) that you may be confusing the two.AMD 1090T BE @ 4050Mhz 1.375vcore, Gigabyte GA-890FXA-UD5 F3 BIOS, GSkill Flare 2x2Gb 1.65v F3-16000CL7D-4GBFLS 7-9-7-24-1T @ 2000Mhz, GSkill Phoenix Pro 120Gb SSD, 2 x Gigabyte HD6870 xfired.
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Definitely a difference NB is the chipset on the mobo....CPU-NB is the voltage to the IMC in the CPU for operations, there's a decent article that touches on this subject and the Phenom II OCing here:
http://www.techreaction.net/forums/showthread.php?t=367
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