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amdking said:is anyone gonna try one of these? Im anxious to see how well they overclock, they are all CG revision and really inexpensive and default voltage of 1.4v
These may be gem overclockers....but noone has tried yet...
anyone goin too?
I wish I could LOL
???hitechjb1 said:
Apart from how well it can overclock (which at this point probably no one knows among us), I see there is some potential problem with this one for overclocking, ..., will post what I think later, ....
Let other give some comment first.
Gautam said:
???
Would love to hear your input. What's wrong with it??
1.4v spec looks great, as does 1mb L2 cache. It's a CG Clawhammer like mine; 2.4-2.5ghz should be a safe bet with it.
d]g[ts said:I was bored so I did some testing allbeit limited.
A64 3200+ run at 2407 in all test. Ram is single stick of KHX3000 with 2-2-2-5 timmings @ 200 (CPU/12 divider as listed by CPU-Z)and 2.5-4-4-8 timmings @240 ( I know I could do better timmings here but these are average crap timmings for PC4000 ram)
Hexus Pifast
1:1 52.05 seconds
CPU/12 52.14 seconds
SuperPI 8meg
1:1 7 min 50 sec.
CPU/12 7 min 38 sec.
SuperPI 1meg
1:1 37 sec
CPU/12 37 sec
Sandra CPU arithmetic
1:1 10495/3817/4912
CPU/12 10495/3817/4911
Sandra CPU multimedia
1:1 23053/24787
CPU/12 23052/24787
Sandra MEM bandwidth
1:1 3728/3728
CPU/12 3135/3136
All but 2 test are equal Superpi 8meg seems to like tight timmings no matter what, And sandra memory bench I have always taken with a grain of salt.
I would have done some 3d test for you but if ya look in the sig you will understand why I didn't
If ya have another bench you want me to try LMK and dig me up a link.
On my 25K run ( Had 3 so far all different setups )
1. A64 @ 2430 ram @ 220 2-2-2-6 vid card @ 517/406 25056
2. A64 @ 2475 ram @ 247 2.5-2-2-6 vidcard @ 500/400 25114
3. A64 @ 2475 ram @ 247 2.5-2-2-6 vidcard @ 500/400 25213
Gautam said:Async is your friend.
Don't forget that the A64's memory controller is much more efficient than the off-die ones found in AXP chipsets. I don't run at 250x10 sync myself; I run at only 210 with a CPU/12 ratio. Running with this divider is rather analogous to running at 210x12. Efficiency per Sandra is consistently 95%, regardless of divider, a very different story in comparison to the AXP. Running HTT speeds of up to about 350 are no problem at all, so up to about 2.8GHz, there shouldn't be any issues.
hitechjb1 said:
If you are correct about the ASYNC memory efficiency to 95%, then
can we get this scenario to run with 250 GB or K8T800 PRO
FSB setting = 320 MHz to max out CPU around 2560 MHz with X8 multiplier.
HT bus at 320 x 4 = 960 MHz
Memory with async 4:5 to run memory bus at 320 x (4/5) = 256 MHz (say using DDR 500 modules).
If so, problem solved.
Increasing memory from 220 to 247 only improve the 25K number very little. Was it due to drop in video card overclocking?On my 25K run ( Had 3 so far all different setups )
1. A64 @ 2430 ram @ 220 2-2-2-6 vid card @ 517/406 25056
2. A64 @ 2475 ram @ 247 2.5-2-2-6 vidcard @ 500/400 25114
3. A64 @ 2475 ram @ 247 2.5-2-2-6 vidcard @ 500/400 25213
Gautam said:
...
One other thing- for people with much, much, much more electrical experience than me, a voltmod should let an A64 fly. They do scale very well with voltage, and 1.7v/2.5GHz is very impressive. The potential of what a vcore mod would deliver is tremendous. With 2.1v and sufficient cooling, I'd say 3 GHz is in the crosshairs.
hitechjb1 said:
Do you mean the motherboard cannot set higher CPU voltage.
I looked the AMD tech doc for 754, there are five pins VID[0:4] which define the default voltage. I think if one spend time sometime to look at it, some wire trick mod can be done as in the case for XP.
Just glancing through the AMD tech doc briefly, the max absolute ratings on Vcore is only 1.65 V, which is much smaller than that of the various Tbred B/Barton of 2.05 to 2.20V.
The max voltage to the HT I/O circuit is 1.5 V (even lower).
The max voltage to the memory controller SDRAM I/O circuit is 2.9 V.
For details, refer to the AMD tech doc.
The abs max voltage table is also in
A64 CPUs, chipsets, motherboards
So be careful about applying too high voltage to the A64 CPU.
Gautam said:Go to a local Circuit City when they have a promotion on Kingston ValueRAM. You can look through the packages until you find one with Hynix BT-D43 chips, which are capable of 270-280MHz using 4-4-3 timings and 2.6-2.8v quite consistently. They are the same IC's found in many of the good PC4000 modules. Extremely inexpensive as well; around $70 for a 512mb module IIRC.
But, I thought that for the nature of your work, 939 was better suited?
Originally posted by hitechjb1
If you are correct about the ASYNC memory efficiency to 95%, then
can we get this scenario to run with 250 GB or K8T800 PRO
FSB setting = 320 MHz to max out CPU around 2560 MHz with X8 multiplier.
HT bus at 320 x 4 = 960 MHz
Memory with async 4:5 to run memory bus at 320 x (4/5) = 256 MHz (say using DDR 500 modules).
If so, problem solved.
Originally posted by hitechjb1
Shouldn't be an issue at all. One could use, for example, 2.5x320 and remain in spec exactly. I run at 2.5x250 for 625; no problems here. I have run at 310x2 in the past and things seemed fine, but many have run into the 350's on both the K8T800 and nF3 150 alone.
PS to your last, most do overclocking inside of Windows using Clockgen. The BIOS maxes aren't usually relevant. I don't even remember what the maximum selectable in my BIOS is; I think it's only 250.