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  #1 (permalink)  
Old 7th April, 2003, 04:48 AM
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Wierd problem with 8RDA @200FSB

Hey guys I've just bought a Epox 8RDA which has the new A1/C1 stepping. It ran 200FSB straight out of the box without any mod, together with some 512MB Samsung PC3200 CL3. Anyway, I'm having some wierd problem at this magical 200FSB, read on.

System Spec:
JIUHB 1700+ DLT3C 0308RPMW
Alpha PAL8045 + Elanvital 43CFM fan + Coolingflow
Epox 8RDA (A1/C1 stepping) BIOS 3305
Samsung Original PC3200 CL3 512MB x 1
Chieftec DX-01WD + 3 case fans
Enermax 330W PSU

The 1700+ is now doing 2.3GHz (12.5*184) @ 1.7V, tested with 10hrs of Prime95.
Now the problem is, the system runs rock solid with CPU at 2GHz (10*200) @ 1.5V, even tested with loops of 3DMark + Prime95 overnight. However, it fails at 2.1GHz (10.5*200) even @ 1.85V!

In summary:
2GHz 10*200 1.5V <= OK
2.1GHz 10.5*200 1.85V <= Failed
2.1GHz 12.0*175 1.6V <= OK
2.1GHz 12.5*168 1.6V <= OK
2.2GHz 12.5*177 1.65V <= OK
2.3GHz 12.5*184 1.7V <= OK

What's up? 200FSB failing when CPU is faster than 2.1GHz! A quick look at MBM5 reveals that the voltage readings are actually flunctuating by a large amount, except for VDD and VDIMM. For example, Vcore is 1.65V~1.75V (1.7V set in BIOS), +5.00 is 4.76V~4.92V, +12.00V is 11.98V~12.40V.
Could it be the cause of the unstable voltage supply of PSU? By the way, I just had the PSU serviced/repaired from the warranty, so maybe that's the problem? Later, I will try my system on a SPI 300W and see what happnes.

Anyone have a clue? Anyone seen this before?

Thanks in advance.
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Old 7th April, 2003, 07:32 AM
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hey dude,

firstly i would rekonmend that u get a new psu - 330w will not help with overclocking at all and secondly do u have any active or passive cooling on ur mosphets? cos that could help to stable out ur voltages
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Old 7th April, 2003, 08:43 AM
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Yeap, PSU is the first thing that you should try to switch.
Some cooling on the NB, SB and MOSFTEs would also help.
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Old 9th April, 2003, 05:08 PM
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I had to raise my core voltage on the cpu when over 200fsb for some reason.
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Old 9th April, 2003, 06:29 PM
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It may be a quirk with that multilyer.

Have you tried 11x200 yet?
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Old 10th April, 2003, 04:46 AM
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OK guys, sorry for this late reply.

Now the system is running 2.3GHz (11.5*200) at 1.7V, just passed 15hrs+ of Prime95, full loading temperature around 53C with a case temperature of 28C.
However, it still fails 2.1GHz at 200FSB, even if I have the voltage up to 1.85V, won't even get into Win2k SP3.

Wierd
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Old 10th April, 2003, 05:08 AM
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Here are some stats:
180x11=1997 prime stable at 1.5v
180x12=2167 prime stable at 1.65v
200x9.5=1900 prime stable but 1.75v needed
200x10.5=2205 no go overclocking error stated failed for me too
210x9.5=1995 prime stable but 1.75 needed
220x9.5=2090 prime stable but 1.8v needed

According to mbm the lows are as follows:
+3.3 @ 2.75
+5.5 @ 4.89
+12 @ 12.02

Right now i am at 12x200 @1.75v
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Old 9th August, 2003, 08:27 PM
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Hello all,

I've been running a 1700+ on this 1.1 8RDA+ board for a few months now. It has been all the way up to 2.61GHz with POS watercooling but I had to back down because of the extremely high ambient temperatures (~33C in this room). One thing you have to make sure of is to put a massive heatsink on the MOSFETs and actively cool them; otherwise voltages will start fluctuating +/-.05v. If you have an HSF with overhanging fan (like the SLK800), then you can probably get away with not putting a fan directly on the MOSFET heatsink.

However, if you want to do any type of overvolting and have a waterblock, a heatsink+fan is absolutely necessary. I had to cut the overcurrent protection pin on the VREG chip to get any higher than 1.75v without the system shutting down. This starkly contrasted with the 2400+ that was in here previously - I could do 1.95v and more without tripping the OCP. I have a theory that the 1700+ DLT3C draws power more evenly (constantly), thus taxing the voltage regulators more. But that's another story. Also, the plastic around all +5v pins on the ATX connector eventually burned up (and on the of wires started catching on fire) giving me second thoughts about disabling OCP.

In reality, if you want high clock speeds+high vcores, watercooling on the MOSFETs is a necessity. You can make your own or get one from the likes of Logicooling.com.

Moral of the story - Beefiest PSU possible, Watch temps, watch mosfets, and be very cautious after disabling OCP.

Hope this helped
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