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which ddr4 memory for ryzen? - Page 5

post #41 of 43
Originally Posted by s002wjh View Post

any idea which ram has sam B die

G. Skill Flare X is Ryzen certified and guaranteed to run at its rated clock speed.. I have 16 GB kit in my machine now F4-3200C14D-16GFX. Two 8GB dimms single rank cas 14-14-14-14-34 1.35v.
Works like a charm.
post #42 of 43
Originally Posted by iRUSH View Post

The heatsink suggests that it's 1st Gen ddr4.

Could be an issue. At least till May's big BIOS updates allegedly.

1st Gen DDR4 would have been Ripjaws IV, wouldn't it?
post #43 of 43
How to tell which DDR4 memory for Ryzen you are buying

Here's how much you can tell by looking at the box when buying memory:

Before you buy -
1) serial number barcodes on the box tells chip maker but not die type:
• G-skill symbols 1-4 are year & week, symbol 6 is chip maker. 4 Hynix (Hyundai), 5 Samsung; e.g. 1701A400xxxxxxx is Hynix.
• Kingston (HyperX) symbol 4 is chip maker: H Hynix, M Micron, N Nanya, S Samsung, E Elpida, K random, symbols 5-6 are # of chips: 08 single-sided, 16 dual-sided, symbol 7month,8-9 year.
• Corsair symbols 1-4 are year & week, chip maker only visible on chips label: ver2 Elpida,ver3 Micron, ver4 Samsung, ver5 Hynix. Some boxes have a window.
• Crucial uses Micron chips.

2) see if the model of planned purchase is listed in http://www.overclock.net/t/1627555/ryzen-memory-ic-collection-thread#post_25997823

3) find chip maker with Thaiphoon Burner (softnology.biz) - search database in Tools-SPD Browser, select class DDR4, download.

4) find rank or sides in larger QVL lists as in http://download.gigabyte.cn/FileList/Memory/mb_memory_ga-z270x-gaming8.pdf
or in https://dlsvr04.asus.com/pub/ASUS/mb/LGA1151/STRIX_Z270G_GAMING/STRIX_Z270G_GAMIN_Memory_QVL.pdf

After you buy -
5) verify/submit your chip info to Thaiphoon database: in EEPROM-read SPD; it may ask if your chip is not in their database.

actual speeds from experience:
Corsair Vengeance CMK16GX4M2B3000C15 15-17-17-35 is Hynix dual-sided 2x8GB ran 2666-16-16-16-36
G-Skill Ripjaw V F4-3200C14D-32GVR 14-14-14-34 is Samsung dual-sided 2x16GB ran at 2666-16-16-16-36
G-Skill TridentZ F4-3400C16D-32GTZ 16-16-16-36 is Samsung B-die dual-side. 2x16GB ran fine to 3200-18
G-Skill TridentZ F4-3400C16D-32GTZ another pair with Samsung dual-side 2x16GB ran at 2666-16-16-16-36
G-Skill TridentZ F4-3200C16D-16GTZB 16-18-18-38 is Hynix M-die single-side 2x8GB ran 3200-14-16-16-36; same chips as 4x8GB (32GB) runs 3200 with relaxed timings 18-18-18-38.

some lingo:
Dual channel - two DIMMs are a matched pair. Quad channel (as in C16Q-32) is four dimms. Slight speed difference.
Dual sided - chips are mounted on both sides of DIMM. This may be peeked visually. Single is preferred (less data traffic per memory socket).
Dual rank - data channel width. Slight speed difference. CPU-Z can tell if your memory is single or dual rank.

To summarize:
Faster memory (3000, 3200, 3400 and above) may reach 2933 or 3200+ speed with faster Ryzens.
Samsung B-die usually is in 3200-14 or 3400-16 or faster rated (costlier) kits.
Fastest Samsung may reach 3200 and above.
Hynix may reach 3200.
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