I'm working on writing my own custom tools to work with and tune the GPUs myself. For example, a mostly-decoded set of timings from the stock Sapphire RX 5700 XT (reference) VBIOS for the Micron MT61K256M32 memory ICs (integrated circuits), for frequency ranges 1875Mhz - 1999Mhz, inclusive (or, as shown in Winshit, 937Mhz - 999Mhz, inclusive.) VBIOS P/N is 113-D1820501-101, and it can be found here (with SHA-1 hash 4ad5e0861ddf3b2381c1ce04a8d2799a5e247677): https://www.techpowerup.com/vgabios/212169/sapphire-rx5700xt-8192-190616

[wolf@surody ~/Desktop/VBIOS]$ ohgodadecode C00B0000150A000000000000FA09000040030000172F1F194C001D000808000214000000050A0A001E000000311207000000010101000101001F1800EB0D00000A0A0000E1000000E10000008A2084025E0000000A00040A160300011F2A0C00CF00000002F5130FCF00000000000000
<censored>:	0x00000BC0
	LP1:		0
	LP2:		0
	LP3:		0
	PLLDLLBW:	0
	RAS:		47
<censored>:	0x00000A15
	WLmrs:		5
	RLmrs:		2
	TestMode:	0
	WR:		10
<censored>:	0x00000000
<censored>:	0x000009FA
	EDCHoldPattern:	10
	CRCWL:	7
	CRCRL:	3
	RDCRC:	0
	WRCRC:	0
	EDCInv:	1
<censored>:	0x00000340
	CAL Term.:	0
	CAH Term.:	0
	CATO:		0
	EDC Hi-Z:	0
	CKAC:		0
	RLEHF:		1
	WREHF:		1
	CK Term.:	0

<censored>:	CL: 23		RAS: 47		RCDRD: 31	RCDWR: 25
<censored>:	RC_S: 76	RC_L: 0		RP_S: 29	RP_L: 0
<censored>:	RRDS: 8		RRDL: 8		RTP: 2
<censored>:	FAW: 20		32AW: 0
<censored>:	WL: 5		WTRL: 10	WTRS: 10
<censored>:	WR: 30
<censored>:	PPD: 1		CRCRL: 3	RREFD: 18	CRCWL: 14
<censored>:	RD_RDDD: 0	RD_RDSD: 0	RD_RDSC: 1	RD_RDSCL: 1	RD_RD_BAN: 0
<censored>:	WR_WRMW: 1	WR_WRSC: 1	WR_WRSCL: 1	WR_WR_BAN: 0
<censored>:	WRRD: 0		RDWR: 31
<censored>:	REF: 3563
<censored>:	MRD: 10		MOD: 10
<censored>:	XS: 225
<censored>:	XSMRS: 225
<censored>:	PD: 10		CKSRE: 4	CKSRX: 4	PwrDownDly: 66	AggPwrDownDly: 1
<censored>:	RFCSB: 94	STAG: 0
<censored>:	XP: 10		CPDED: 4	CKE: 10
<censored>:	RDDATA_EN: 22	PHY_WRLAT: 3	PHY_RDLAT: 0	PHY_WRDATA: 1	PARIN_LAT: 0
<censored>:	CKESTAGDLY: 12
<censored>:	ReceiverWait: 207	CommandStageCount: 0	WRMPR: 0
<censored>:	WTRTR: 2	REFTT: 20	TTROW: 63	LDTLD: 4	UPDN: 15	REFTT_MSB: 0
<censored>:	RFC: 207