Depends. Max clock - Samsung UCCC/LCCC. Lowest timings - Infineon CE-5 and some Micron 5B-D chips (very hard to find these days, even Crucial). Keep in mind that none of them can be compared to legendary Winbond BH or Samsung TCCD.

i have an athlon 64 3400+ 754 processor and i have 2gb (two 1gb sticks) of kingston hyperx ddr400 ram. i think its cas3. bought them back in late 2010 for like $200 on ebay new. i'm sure they would be hard to find these days.

kingston hyperx ddr400 ram. i think its cas3.

That's just regular Samsung UCCC with fancy blue heatspreaders.

The main problem is that i'm using 246x11, I had obviously to lower the ddr frequency and now, despite it should be 205 mhz (5/6 divisor), every program show it is something between 180 and 190 mhz, that make me loose like 300 mb of memory bandwidth.
If I use the 200 mhz (1\1 divisor) I get like 5200mb\s, while with the divisors is goes down to 4800.

Also I spent some months watching for some bh5, but I didn't find any, are almost impossible to find used nowadays?

every program show it is something between 180 and 190 mhz, that make me loose like 300 mb of memory bandwidth.

That's because memory dividers are tied to CPU multiplier and will act differently, depending if it's even or uneven number.

Also I spent some months watching for some bh5, but I didn't find any, are almost impossible to find used nowadays?

There's a good chance to find them in early Kingston HyperX 3200/3500 modules, without "A" letter on the end. You can find BH-6 in a lot of ordinary modules though.

So I will have to change multiplier again... I will do some testing, thank you for the tip.

So products code like: KHX3500 or KHX3200?

I usually look for naked modules since they are quite easy to recognize because to the 2 "holes" on the chips.

Any suggestion to what models are TCCD?

I have a pair of Corsair CMX512-3200C2PT XMS3502v5.1 and 5.2 but they aren't any good right?

KHX3500 or KHX3200?

Yeah.

I have a pair of Corsair CMX512-3200C2PT XMS3502v5.1 and 5.2 but they aren't any good right?

They had a lot of revisions and each revision had different chips. 5.x is probably PSC.

Any suggestion to what models are TCCD?

Patriot XBL/XBLK, some OCZ Platinum, A-Data Vitesta.

The Serpent Rider wrote on 2022-03-15, 05:49:

Patriot XBL/XBLK, some OCZ Platinum, A-Data Vitesta.

Thank you, they seem not easy to find unlucky.

I'm struggling to find the best combination keeping the memory around 200 mhz.

You said:

That's because memory dividers are tied to CPU multiplier and will act differently, depending if it's even or uneven number.

It has probably to do with the odd multipliers right? I read old stuff but most of the things now are dead links, can you explain how does the dividers tied to cpu multiplier works?

I saw that the cpu is able to reach 2700 mhz with just 1,25V, but I can't find a proper divisor to keep the memory between 200 and 205 mhz since it needs a even multiplier to keep the divisors work as intended.

It has probably to do with the odd multipliers right? I read old stuff but most of the things now are dead links, can you explain how does the dividers tied to cpu multiplier works?

Yes - https://www.anandtech.com/show/2012/10

but I can't find a proper divisor to keep the memory between 200 and 205 mhz

Probably 12x / 225 HT / 11:12 RAM divider (183 Mhz)

Mh probably on 939 it works in a different way.

Anyway I found the sweetspot at 250x11, with 5/6 divider, it gives 196,5 mhz.
I also found a kit of 512x2 of tccd, it seems that it was the gold standard for that era, sticks with 1gb don't use premium modules.